Question

Write a program in C to find the number of occurrences a given word appears in the given string:

int LeterInAString(char c, char *s);   Check whether the string is NULL. Also, the char could be any char including special symbols.

Answer 1

#include <stdio.h>

int LeterInAString(char c, char *s);

int main() {
    char str[100];
    char ch;
    printf("Enter a string: ");
    scanf("%s", str);
    printf("Enter a letter: ");
    scanf(" %c", &ch);
    printf("Count of %c in %s is %d\n", ch, str, LeterInAString(ch, str));
    return 0;
}

int LeterInAString(char c, char *s) {
    if (s == NULL) return 0;
    int count = 0, i = 0;
    while (s[i]) {
        if (s[i] == c)
            ++count;
        i++;
    }
    return count;
}