Question

i am trying to create a function like strlen() in string.h

It’s giving me the error can not convert char* to char

#include<stdio.h>
#include<conio.h>

int xstrlen(char string);

void main(void) {
  char string[40];
  puts("Enter string:");
  gets(string);
  printf(" %s is the length of %d", string, xstrlen(string));
}

int xstrlen(char string[]) {
  int i;
  for (i=0; ; i++) {
    if (string[i] == '\0')
      break;
  }// for ends
  return i;
}

Answer 1

The xstrlen prototype says that the function takes just a single char. That’s what the compiler knows when compiling your main function – and hence it complains, because you’re passing an array to it.

Note that the xstrlen definition itself has the correct signature (taking an array).

Just fix the xstrlen prototype to read

int xstrlen(char string[]);