Reading textual input

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

void trimCR(char *t) {
  if (t[strlen(t)]=='\0') {t[strlen(t)-1]='\0';} //set last byte-1 to null
}

void main() {
  char tmp[64];
  int num;
  printf("Enter something: ");
  if (fgets(tmp,sizeof tmp,stdin)) {
    num=atoi(tmp); //extract a number from our text
    trimCR(tmp);
    printf("I found the number %d inside '%s' which is %ld characters!\n",num,tmp,strlen(tmp));
  } else {
    printf("There seems to be an error with your input\n");
  }
}