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#include <stdio.h>
 
const int kMaxLength = 30;
 
int main() {
  int i, j;
  char family[kMaxLength + 1];
  char first[kMaxLength + 1];
  char fullname[kMaxLength * 2 + 1 + 1];
 
  printf("Family name: ");
  scanf("%s", family);
  printf("First name: ");
  scanf("%s", first);
 
  for (i = 0; family[i]; i++) {
    fullname[i] = family[i];
  }
  fullname[i++] = ' ';
  for (j = 0; first[j]; i++, j++) {
    fullname[i] = first[j];
  }
  fullname[i] = '\0';
 
  printf("%s\n", fullname);
 
  return 0;
}
 

prog.c: In function ‘main’:
prog.c:12: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
prog.c:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result

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