C Program to Count All Occurrence of a Character in a String

In this article, we will show you, How to write a C Program to Count All Occurrence of a Character in a String with example.

C Program to Count All Occurrence of a Character in a String Example 1

This program allows the user to enter a string (or character array), and a character value. Next, it will search and count the total number of times this character has occurred inside a string.

/* C Program to Count All Occurrence of a Character in a String */
 
#include <stdio.h>
#include <string.h>
 
int main()
{
  	char str[100], ch;
  	int i, Count;
  	Count = 0;
 
  	printf("\n Please Enter any String :  ");
  	gets(str);
  	
  	printf("\n Please Enter the Character that you want to Search for :  ");
  	scanf("%c", &ch);
  	
  	for(i = 0; i <= strlen(str); i++)
  	{
  		if(str[i] == ch)  
		{
  			Count++;
 		}
	}
	printf("\n The Total Number of times '%c' has Occured = %d ", ch, Count);
	
  	return 0;
}

OUTPUT

ANALYSIS
First we used For Loop to iterate each and every character in a String.

for(i = 0; i <= strlen(str); i++)
{
	if(str[i] == ch)  
	{
		Count++;  	
	}
}

str[] = tutorial gateway
ch = t
Count = 0

For Loop First Iteration: for(i = 0; i <= strlen(str); i++)
The condition is True because 0 <= 16.
Within the While Loop we used If Statement to check whether the str[0] is equal to user specified character or not
if(str[i] == ch) => if(t == t)
Above condition is True. So, compiler will execute the statement inside the If block.
Count++
it means Count = 1

Second Iteration: for(i = 1; 1 <= 16; 1++)
The condition is True because 1 <= 16.
if(str[i] == ch) => if(t == l)
Above condition is false. So, i value will be incremented.

Third Iteration: for(i = 2; 2 <= 16; 2++)
if(str[i] == ch) => if(t == t)
Above condition is True.
Count++
It means Count = 2

Do the same for the remaining iterations.

C Program to find All Occurrence of a Character in a String Example 2

This program is same as above. Here, we just replaced the For Lop with While Loop. I suggest you to refer While Loop to understand the Loop iterations.

/* C Program to Count All Occurrence of a Character in a String */
 
#include <stdio.h>
#include <string.h>
 
int main()
{
  	char str[100], ch;
  	int i, Count;
  	i = Count = 0;
 
  	printf("\n Please Enter any String :  ");
  	gets(str);
  	
  	printf("\n Please Enter the Character that you want to Search for :  ");
  	scanf("%c", &ch);
  	
  	while(str[i] != '\0')
  	{
  		if(str[i] == ch)  
		{
  			Count++;
 		}
 		i++;
	}
	printf("\n The Total Number of times '%c' has Occured = %d ", ch, Count);
	
  	return 0;
}

OUTPUT

C Program to find All Occurrence of a Character in a String Example 3

This program is same as first example but this time we used the Functions concept to separate the logic.

/* C Program to Count All Occurrence of a Character in a String */
 
#include <stdio.h>
#include <string.h>

int Count_AllCharcater(char str[], char ch);
 
int main()
{
  	char str[100], ch;
  	int Count;
  	Count = 0;
 
  	printf("\n Please Enter any String :  ");
  	gets(str);
  	
  	printf("\n Please Enter the Character that you want to Search for :  ");
  	scanf("%c", &ch);
  	
  	Count = Count_AllCharcater(str, ch);
  	
	printf("\n The Total Number of times '%c' has Occured = %d ", ch, Count);
	
  	return 0;
}

int Count_AllCharcater(char str[], char ch)
{
	int i, Count;
	Count = 0;
	
  	for(i = 0; i <= strlen(str); i++)
  	{
  		if(str[i] == ch)  
		{
  			Count++;
 		}
	}
	return Count;
}

OUTPUT

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