#include#include int main() { int cnt=0; puts(“请输入秒数”); scanf("%d",&cnt); while(cnt>=0) { sleep(1000); printf("%dr",cnt); cnt–-; } printf(“计时结束n”); return 0; }

#include#include int main() { int cnt=0; puts(“请输入秒数”); scanf("%d",&cnt); while(cnt>=0) { sleep(1000); printf("%dr",cnt); cnt–-; } printf(“计时结束n”); return 0; }