C Source code examples, projects, multiple choice questions, answers

Search results for char

Example:[1]


            Write a C Program macro to check if a character is alphabetic or not.


            #include <stdio.h>
#define ALPHA(CH) ((CH >= 'a' && CH <= 'z') || (CH >= 'A' && CH <= 'Z')?1:0)
int alp(int );
int main()
{
    int al;
    char a = 'a';
    al = alp(a);
    if(al == 1)
    {
        printf("the given char is alpha");
    }else
    {
        printf("the given char is not alpha");
    }
    return 0;
}
int alp(int a)
{
    return ALPHA(a);
}

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Example:[2]


            Write a c program function to create simple calculator using switch case.


            #include <stdio.h>
int main()
{
    char op;
    float num1, num2, result=0.0f;
    printf("Enter [number 1] [operator] [number 2]\n");
    scanf("%f %c %f", &num1, &op, &num2);
    switch(op)
    {
        case '+':
            result = num1 + num2;
            break;
        case '-':
            result = num1 - num2;
            break;
        case '*':
            result = num1 * num2;
            break;
        case '/':
            result = num1 / num2;
            break;
        default:
            printf("Unsupported Operator");
    }
    printf("%.2f %c %.2f = %.2f\n", num1, op, num2, result);
    return 0;
}

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Example:[3]


            Write a C program function  to take a character array in array format and return the last character of the array passed to it.


            #include <stdio.h>
#define SIZE 5
char char_count(char a[]);
int main()
{
	char arr[] = {'H','e','l','l','o'};
	char last;
	last = char_count(arr);
	printf("The last character of the array passed is %c\n",last);
	return 0;
}
char char_count(char array[])
{
	return array[SIZE-1];
}

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Example:[4]


            Write a C program to count the number of characters in a string without using the c inbuilt library.


            #include <stdio.h>
int NoOfChars(char p[]);
int main()
{
    int no_chr;
    char str[] = "Hello How are you";
    no_chr = NoOfChars(str);
    printf("No of chars is: %d\n",no_chr);
    return 0;
}
int NoOfChars(char d[])
{
    int i,count = 0;
    for(i = 0;d[i] != '\0';i++)
    {
        count++;
    }
    return count;
}

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Example:[5]


            Write a C program function to reverse the string passed to it without using the c inbuilt library.


            #include <stdio.h>
void RevString(char p[],char r[]);
void main()
{
    char str[] = "Hello";
    char res[10];
    RevString(str,res);
    printf("Reversed string is: %s\n",res);
}
void RevString(char d[],char s[])
{
    int i,j,k,len = 0;
    for(i = 0;d[i] != '\0';i++)
    {
        len++;
    }
    for(j = 0,k = len-1;d[j] != '\0';j++,k--)
    {
        s[j] = d[k];
    }
    s[len] = '\0';
}

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Example:[6]


            Write a c program to accept a string as input and return the last character of the string as output of the function.


            #include <stdio.h>
char RetLastChar(char *str);
int main()
{
    char *in = "Hello";
    char res;
    res = RetLastChar(in);
    printf("The last char is %c\n",res);
    return 0;
}
char RetLastChar(char *str)
{
    int i;
    char out;
    for(i = 0;str[i] != '\0';i++)
    {
      out = str[i];
    }
    return out;
}

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Example:[7]


            Write a c program function that reverses the string passed to it without declaring any new string within the function.


            #include <stdio.h>
void reverse(char a[]);
int main() {
   char str[10] = "Hello";
   reverse(str);
   printf("\nReverse string is :%s\n", str);
   return (0);
}
void reverse(char d[])
{
   int k,len = 0;
   char temp;
   int i = 0;
   for(k = 0;d[k] != '\0';k++)
   {
      len++;
   }
   while(i < (len - 1))
   {
         temp = d[i];
         d[i] = d[len-1];
         d[len-1] = temp;
         i++;
         len--;
   }
}

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Example:[8]


            Write a program to find the number of times that a given word(i.e. a short string) occurs in a sentence (i.e. a long string!).


            #include <stdio.h>
#include <string.h>
unsigned int search_word(char *,char *);
int main()
{
    char *s_str = "the";
    char *l_str = "the word searching for from these sentence is the.";
    unsigned int result;
    result = search_word(s_str,l_str);
    printf("Small string is found %d times in long string\n",result);
    return 0;
}
unsigned int search_word(char *s1,char *s2)
{
    int times = 0;
    int i = 0,j = 0,k = 0;
    int size = strlen(s1);
    printf("Size of small string \" %s \" is: %d\n",s1,size);
    while(s2[j] != '\0')
    {
        if(j >= (size - 1))
        {
            if(s2[j] == s1[size-1] && s2[j-1] == s1[size-2] && s2[j-2] == s1[size-3])
            {
                times = times + 1;
            }
        }
        j++;
    }
    return times;
}

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Example:[9]


            Write a c program function to accept a string and return the character written two times continuously in the string.


            #include <stdio.h>
char res_char(char *);
int main()
{
    char *str = "Hello how are you";
    char result;
    result = res_char(str);
    printf("Got result %c\n",result);
    return 0;
}
char res_char(char *f)
{
    char res;
    while(*f != '\0')
    {
        if(*f == *(f + 1))
        {
        res = *f;
        }
        f++;
    }
    return res;
}

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Example:[10]


            Write a C program function to count frequency of each character in a string and return the maximum frequency.


            #include <stdio.h>
int freq_func(char *);
int main()
{
	char *s = "Here is the string that needs to be verified for the frequency of each character";
	int max_freq;
	max_freq = freq_func(s);
	printf("Max Frequency is:%d\n",max_freq);
	return 0;
}
int freq_func(char *r)
{
	int i =0,j = 0,res1 = 0,res2 = 0;
	while(r[j] != '\0')
	{
		while(r[i] != '\0')
		{
			if(r[j] == r[i])
			{
				res1 = res1 + 1;
			}
			i++;
		}
		if(res1 > res2)
		{
			res2 = res1;
		}
		i = 0;
		res1 = 0;
		j++;
	}
	return res2;
}

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Example:[11]


            Write a C program function to take a string as its input and return the first word of the string passed to it.


            #include <stdio.h>
void getfword(char *s, char f_word[]);
int main() {
	char str[] = "Hello how are you";
	char res[20];
	getfword(str,res);
	printf("Result is:%s\n", res);
}
void getfword(char *s, char f_word[])
{
	int i = 0;
	while(s[i] != '\0')
	{
		if(s[i] == ' ')
		{
			break;
		}else
		{
			f_word[i] = s[i];
			f_word[i + 1] = '\0';
			i++;
		}
	}
}

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Example:[12]


            Write a c program function to calculate the number of words present in a string passed to it.


            #include <stdio.h>
int NumOfWords(char *s);
int res = 1;
int main() {
	char str[] = "Hello how are you";
	res = NumOfWords(str);
	printf("Result is:%d\n", res);
}
int NumOfWords(char *s)
{
	int i = 0;
	while(s[i] != '\0')
	{
		if(s[i] == ' ')
		{
			res = res + 1;
		}
		i++;
	}
	return res;
}

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Example:[13]


            Write a c program function to reverse the string passed to it using pointers and without using the c inbuilt library.


            #include <stdio.h>
#include <stdlib.h>
void RevString(char *,char *);
int main()
{
   char *str = "Hello";
   char *res;
   res = (char *)malloc(10);
   RevString(str,res);
   printf("Reversed string is %s\n",res);
   return 0;
}
void RevString(char *s,char *r)
{
   int i,j,k,len = 0;
   for(i = 0;*(s+i) != '\0';i++)
   {
      len++;
   }
   for(j = 0,k = len-1;*(s+j) != '\0',k > -1;j++,k--)
   {
      *(r+j) = *(s+k);
   }
}

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Example:[14]


            Write a c program function to return the same string after reversing it using pointers


            #include <stdio.h> 
#include <string.h> 
void reverseString(char* str) 
{ 
    int l, i; 
    char *begin_ptr, *end_ptr, ch; 
    l = strlen(str); 
    begin_ptr = str; 
    end_ptr = str;  
    for (i = 0; i < l - 1; i++) 
    {
        end_ptr++; 
    } 
    for (i = 0; i < l / 2; i++) 
    { 
        ch = *end_ptr; 
        *end_ptr = *begin_ptr; 
        *begin_ptr = ch; 
        begin_ptr++; 
        end_ptr--; 
    } 
} 
int main() 
{ 
    char str[10] = "Hello"; 
    reverseString(str); 
    printf("Reverse of the string: %s\n", str); 
    return 0; 
}

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Example:[15]


            Write a c program function to take your name as input using fgets stdin and print the name as output


            #include <stdio.h>
#include <stdlib.h>
#define MAX_COUNT 20
void getName(char *name);
void main(){
	char myName[20];
	getName(myName);
	printf("Your name:%s\n",myName);
}
void getName(char *name){
	printf("Enter your name:");
	fgets(name,MAX_COUNT,stdin);
}

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Example:[16]


            Write a c program to accept a string as input and return the number of words present in it using pointers.


            #include <stdio.h>
void NumOfWords(char *s, int *);
int main() {
	char str[] = "Hello how are you";
	int res = 1;
	NumOfWords(str,&res);
	printf("Result is:%d\n", res);
}
void NumOfWords(char *s, int *r)
{
  int i = 0;
  while(s[i] != '\0')
  {
    if(s[i] == ' ')
    {
      	*r = *r + 1;
    }
    i++;
  }
}

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Example:[17]


            Write a function to loop through the strings present in an array of pointers to string


            #include <stdio.h>
char *StringSet[] = {
		"string1 1 0 2 0",
		"string2 1 2 0 5 9",
		"string3 0 9 2",
		""
};
int main(){
	int i = 0;
	while(*StringSet[i] != '\0'){
		printf("String %s\n",StringSet[i]);
		i++;
	}
}

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Example:[18]


            Write a program to swap the 4bytes of an integer. If input is provided as 0x12345678 output is generated as 0x78563412.


            #include <stdio.h>
union out
{
   struct
   {
      unsigned char ll;
      unsigned char lh;
      unsigned char hl;
      unsigned char hh;
   }in;
   unsigned int b;
};
int main()
{
   union out aa;
   aa.b = 0x12345678;
   printf("Before swapping:%x\n", aa.b);
   unsigned char ll = aa.in.ll;
   unsigned char lh = aa.in.lh;
   aa.in.ll = aa.in.hh;
   aa.in.hh = ll;
   aa.in.lh = aa.in.hl;
   aa.in.hl = lh;
   printf("After swapping:%x\n", aa.b);
   return 0;
}

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Example:[19]


            Write a function to determine whether the machine is Little Endian or Big Endian.


            #include <stdio.h>
unsigned int EndianCheck();
union endian
{
   unsigned int a;
   char b;
};
int main()
{
   unsigned int res;
   res = EndianCheck();
   if(res == 0)
   {
      printf("Little endian\n");
   }else
   {
      printf("Big endian\n");
   }
   return 0;
}
unsigned int EndianCheck()
{
   union endian test;
   test.a = 1;
   if(test.b == 1)
   {
      return 0;
   }else
   {
      return 1;
   }
}

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Example:[20]


            Write a C program function to enter different book information(pages, author, search id) in a school library.


            #include <stdio.h>
#define NO_BOOKS 3
struct Book
{
	int pages;
	char author[10];
	int search_id;
};
void EnterBooks(struct Book *);
int main()
{
	struct Book b[NO_BOOKS];
	EnterBooks(b);
	return 0;
}
void EnterBooks(struct Book *a)
{
	int i;
	for(i = 0;i < NO_BOOKS;i++)
	{
		printf("Enter %d book pages\n", i+1);
		scanf("%d",&a->pages);
		printf("Enter %d book author\n", i+1);
		scanf("%s",&a->author);
		printf("Enter %d search id\n", i+1);
		scanf("%d",&a->search_id);
		a++;
	}
}

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Example:[21]


            Write a C program function to enter different book information(pages, author, search id) in a school library and display the existing books using structure pointers.


            #include <stdio.h>
#include <stdlib.h>
#define NO_BOOKS 3
struct Book
{
	int pages;
	char author[10];
	int search_id;
};
void EnterBooks(struct Book *);
void DisBooks(struct Book *);
int main()
{
	struct Book *b;
	b = (struct Book *)malloc(sizeof(struct Book)*NO_BOOKS);
	if(b == NULL)
	{
		printf("Req memory allocation failed\n");
	}else
	{
		EnterBooks(b);
		DisBooks(b);
	}
	free(b);
	return 0;
}
void EnterBooks(struct Book *a)
{
	int i;
	for(i = 0;i < NO_BOOKS;i++)
	{
		printf("Enter %d book pages\n", i+1);
		scanf("%d",&a->pages);
		printf("Enter %d book author\n", i+1);
		scanf("%s",&a->author);
		printf("Enter %d search id\n", i+1);
		scanf("%d",&a->search_id);
		a++;
	}
}
void DisBooks(struct Book *a)
{
	int i;
	for(i = 0;i < NO_BOOKS;i++)
	{
		printf("Book %d pages %d\n",i+1,a->pages);
		printf("Book %d author %s\n",i+1,a->author);
		printf("Book %d book search id %d\n",i+1,a->search_id);
		a++;
	}
}

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Example:[22]


            Write a C program function to enter different book information(pages, author, search id) in a school library and display the existing books using structure arrays.


            #include <stdio.h>
#define NO_BOOKS 3
struct Book
{
	int pages;
	char author[10];
	int search_id;
};
void EnterBooks(struct Book *);
void DisplayBooks(struct Book *);
int main()
{
	struct Book b[NO_BOOKS];
	EnterBooks(b);
	DisplayBooks(b);
	return 0;
}
void EnterBooks(struct Book *a)
{
	int i;
	for(i = 0;i < NO_BOOKS;i++)
	{
		printf("Enter %d book pages\n", i+1);
		scanf("%d",&a->pages);
		printf("Enter %d book author\n", i+1);
		scanf("%s",&a->author);
		printf("Enter %d search id\n", i+1);
		scanf("%d",&a->search_id);
		a++;
	}
}
void DisplayBooks(struct Book a[])
{
	int i;
	for(i = 0;i < NO_BOOKS;i++)
	{
		printf("Book %d pages %d\n",i+1,a[i].pages);
		printf("Book %d author %s\n",i+1,a[i].author);
		printf("Book %d book search id %d\n",i+1,a[i].search_id);
	}
}

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Example:[23]


            Write a C program function to enter different book information(pages, author, search id) in a school library and search any book using search id and structure arrays.


            #include <stdio.h>
#define NO_BOOKS 3
struct Book
{
	int pages;
	char author[10];
	int search_id;
};
void EnterBooks(struct Book *);
struct Book *SrchBook(struct Book a[]);
int main()
{
	struct Book b[NO_BOOKS];
	EnterBooks(b);
	struct Book *s;
	s = SrchBook(b);
	printf("Book pages:%d\n", s->pages);
	printf("Book author:%s\n", s->author);
	printf("Book search_id:%d\n", s->search_id);
	return 0;
}
void EnterBooks(struct Book *a)
{
	int i;
	for(i = 0;i < NO_BOOKS;i++)
	{
		printf("Enter %d book pages\n", i+1);
		scanf("%d",&a->pages);
		printf("Enter %d book author\n", i+1);
		scanf("%s",&a->author);
		printf("Enter %d search id\n", i+1);
		scanf("%d",&a->search_id);
		a++;
	}
}
struct Book *SrchBook(struct Book a[])
{
	int i,id;
	printf("Enter the book search id\n");
	scanf("%d",&id);
	for(i = 0;i < NO_BOOKS;i++)
	{
		if(id == a[i].search_id)
		{
			return &a[i];
		}
	}
	if(i == NO_BOOKS)
	{
		printf("Invalid Search_id, try again\n");
		return NULL;
	}
}

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Example:[24]


            Write a C program function to enter different book information(pages, author, search id) in a school library and search any book using search id and structure pointers.


            #include <stdio.h>
#include <stdlib.h>
#define NO_BOOKS 3
struct Book
{
	int pages;
	char author[10];
	int search_id;
};
void EnterBooks(struct Book *);
struct Book *SrchBook(struct Book *);
int main()
{
	struct Book *b;
	b = (struct Book *)malloc(sizeof(struct Book)*NO_BOOKS);
	if(b == NULL)
	{
		printf("Req memory allocation failed\n");
	}else
	{
		EnterBooks(b);
		struct Book *s;
		s = SrchBook(b);
		printf("Book pages:%d\n", s->pages);
		printf("Book author:%s\n", s->author);
		printf("Book search_id:%d\n", s->search_id);
	}
	free(b);
	return 0;
}
void EnterBooks(struct Book *a)
{
	int i;
	for(i = 0;i < NO_BOOKS;i++)
	{
		printf("Enter %d book pages\n", i+1);
		scanf("%d",&a->pages);
		printf("Enter %d book author\n", i+1);
		scanf("%s",&a->author);
		printf("Enter %d search id\n", i+1);
		scanf("%d",&a->search_id);
		a++;
	}
}
struct Book *SrchBook(struct Book *a)
{
	int i,id;
	printf("Enter the book search id\n");
	scanf("%d",&id);
	for(i = 0;i < NO_BOOKS;i++)
	{
		if(id == a->search_id)
		{
			return &a[i];
		}
		a++;
	}
	if(i == NO_BOOKS)
	{
		printf("Invalid Search_id, try again\n");
		return NULL;
	}
}

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Example:[25]


            Write a C program function  to swap the nibbles in a byte.


            #include <stdio.h>
unsigned char function(unsigned char );
int main()
{
	unsigned char pass = 0x12;
	printf("Input byte is: %x\n", pass);
	unsigned char res;
	res = function(pass);
	printf("The result is %x\n",res); 
}
unsigned char function(unsigned char d)
{
	return ((d << 4) | (d >> 4));
}

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