String operator: get length, compare and find a char

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

int main(void)
{
  char s1[80], s2[80];

  gets(s1);
  gets(s2);

  printf("lengths: %d %d\n", strlen(s1), strlen(s2));

  if(!strcmp(s1, s2)) 
      printf("The strings are equal\n");

  strcat(s1, s2);
  printf("%s\n", s1);

  strcpy(s1, "This is a test.\n");
  printf(s1);
  
  if(strchr("hello", 'e')) 
       printf("e is in hello\n");
 
  if(strstr("hi there", "hi")) 
      printf("found hi");

  return 0;
}

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String operator: get length, compare and find a char : String Length « String « C / ANSI-C

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