はやりのランダムSTAP細胞

random_stap.c

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

#define ANS "STAP"

void rand_stap(char* buff){
  int i;
  for(i=0; i<4; i++)
    buff[i] = rand() % 26 + 65; /* from A(65) to Z(90) */
}

int main(){
  int i=0, cond=1;
  char buff[] = "0000";

  srand((unsigned)time(NULL));  /* init rand */
  while(strcmp(buff, ANS) != 0){
    i++;
    rand_stap(buff);
    printf("%s細胞", buff);
  }
  printf("%d回目で陽性かくにん!よかった\n", i);
}