Question

using c,

Write a function called p4. The function takes 2 parameters, both of which are C strings. p4 should return “true” (not 0) if the 2ndparameter is a substring of the 1st parameter, or “false” (0) otherwise. Forexample:

char topic[] = “computer”;
char substr[] = “put”;
printf(“%d\n”, p4(topic, substr); // prints 1
substr[0] = ‘P’;
printf(“%d\n”, p4(topic, substr); // prints 0 – case sensitive char s1[] = “ababcd”;
char s2[] = “abcd”
char s3[] = “baba”;
char s4[] = “baba”;
printf(“%d %d\n”, p4(s1,s2), p4(s1,s3)); // 1 0printf(“%d\n”, p4(s3,s4)); // 1

Answer 1

#include <stdio.h>
#include <stdbool.h>

int p4(const char s[], const char t[]){
   int i = 0,j = 0;
   while(s[i]!='\0' && t[j]!='\0'){
      if(s[i] == t[j]){
         j++;
      }
      else{
         j = 0;
      }
      i++;
   }
   if(t[j] == '\0'){
      return true;
   }
   else{
      return false;
   }
}

int main(void) {
   char topic[] = "computer";
   char substr[] = "put";
   printf("%d\n", p4(topic, substr));
   substr[0] = 'P';
   printf("%d\n", p4(topic, substr));
   char s1[] = "abcd";
   char s2[] = "baba";
   char s3[] = "baba";
   printf("%d %d\n", p4(s1,s2), p4(s2,s3)); 
   return 0;
}

Process exited after 0.0308 seconds with returnvalue 0 Press any key to continue . - .