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C > Strings Code Examples

C program to count occurrences of a character in a string

C program to count occurrences of a character in a string

Write a C program to count all occurrences of a character in a string using loop. How to find total occurrences of a given character in a string using for loop in C programming. 

    Input a string from user, store it in some variable say str.
    Input character to search occurrences, store it in some variable say toSearch.
    Initialize count variable with 0 to store total occurrences of a character.
    Run a loop from start till end of string str. The loop structure should look like while(str[j] != '\0').
    Inside the loop if current character of str equal to toSearch, then increment the value of count by 1.

#include <stdio.h>
#define maxsize 100 // Maximum string size

int main()
{
    char str[maxsize];
    char toSearch;
    int j, count;

    /* Input string and search character from user */
    printf("Enter any string: ");
    gets(str);
    printf("Enter any character to search: ");
    toSearch = getchar();

    count = 0;
    j=0;
    while(str[j] != '\0')
    {
        /*
         * If character is found in string then
         * increment count variable
         */
        if(str[j] == toSearch)
        {
            count++;
        }

        j++;
    }

    printf("Total occurrence of '%c' = %d", toSearch, count);

    return 0;
}

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