C Tutorial/String/String Search

Find occurrences of one string in another

<source lang="cpp">#include <stdio.h>

1. include <string.h>
2. include <ctype.h>

int main(void) {

 char text[100];
 char substring[40];
 printf("\nEnter the string to be searched(less than 100 characters):\n");
 fgets(text, sizeof(text), stdin);
 printf("\nEnter the string sought (less than 40 characters ):\n");
 fgets(substring, sizeof(substring), stdin);
 /* overwrite the newline character in each string */
 text[strlen(text)-1] = "\0";
 substring[strlen(substring)-1] = "\0";
 int i;
 for(i = 0 ; (text[i] = toupper(text[i])) ; i++);
 for(i = 0 ; (substring[i] = toupper(substring[i])) ; i++);
  printf("\nThe second string %s found in the first.",((strstr(text, substring) == NULL) ? "was not" : "was"));
 return 0;

}</source>

Enter the string to be searched(less than 100 characters):
     string
     
     Enter the string sought (less than 40 characters ):
     str
     
     The second string was found in the first.