finding the same words in two strings in c

Question

#include <stdio.h>
#include <string.h>

int main(int argc, char* argv[])
    {
    char* firstString = argv[1];
    char* secondString = argv[2];
    int i, j;
    int flag = 0;
    for (i=0; i<strlen(firstString); i++)
    {
        for (j=0; j<strlen(secondString); j++)
        {
            if (firstString[i] == secondString[j])
            {
                flag = 1;   
            }
            else
            {
                flag = 0;
                break;
            }
        }
    }
    if (flag == 1)
    {
        printf ("true\n");
        return 0;
    }
    else
    {
        printf ("false\n");
    }
    return 1;
}

So the program I need to write is to compare 2 text strings, and if the same words in the second string appears in the first string, then i print true, otherwise, I print false.

So for example, "I hate you" "hate" --- this would print true "I hate you" "I am a walrus" --- this would print false

But for some reason, this code just keeps print false and I dunno what's wrong with it. Would anyone be able to help me?

Thanks!

Answer 1

you can try as :

int main(int argc, char* argv[])
{
    char* firstString = argv[1];
    char* secondString = argv[2];
    int flag = 0;
    int count=0;

    int len2=strlen(secondString);
   while(*firstString!=NULL)
   {
      while((*firstString==*secondString)&&(*secondString!='\0')){
          firstString++;
          secondString++;                             
          count++;                            
      }
    firstString++;
    if(count==len2){
     flag=1;
     break;
    }
    else
     flag=0;

 }   


    if (flag == 1)
    {
        printf ("true\n");

    }
    else
    {
        printf ("false\n");
    }

    return 0;
}