消除warning: assignment makes pointer from integer without a cast

[ssssss1123124]

源代码：
#include <stdio.h>

int main(int argc, char *argv[])
{
char str[10] = "I'm a man";

char *p;

int num = 'm';
p = strchr(str, num);
if( NULL != p){
printf("%d\n", p - str + 1);
}

p = strrchr(str, 'm');
if( NULL != p){
printf("%d\n", p - str + 1);
}
}

代码能运行 但是报出
warning: assignment makes pointer from integer without a cast
为什么？怎么解决？

[swl82560397pq]

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

[yzx714]

#include <string.h>
gcc就这个警告