C Programming Code Examples C > Strings Code Examples search all occurrences of a word in given string search all occurrences of a word in given string Write a C program to search all occurrences of a word in given string using loop. How to find index of all occurrences of a word in given string using loop in C programming. Logic to search all occurrences of a word in given string. #include <stdio.h> #include <string.h> #define maxsize 100 // Maximum string size int main() { char str[maxsize]; char word[maxsize]; int i, j, found; int strLen, wordLen; /* Input string and word from user */ printf("Enter any string: "); gets(str); printf("Enter any word to search: "); gets(word); strLen = strlen(str); // Find length of string wordLen = strlen(word); // Find length of word /* Run a loop from starting index of string to length of string - word length */ for(i=0; i<strLen - wordLen; i++) { // Match word at current position found = 1; for(j=0; j<wordLen; j++) { // If word is not matched if(str[i + j] != word[j]) { found = 0; break; } } // If word have been found then print found message if(found == 1) { printf("'%s' found at index: %d \n", word, i); } } return 0; }
