以下程序对输入的四个整数，按从小到大的顺序输出。请在内填入正确内容。main(){int t,a,b,c,d;printf(“input a,b,c,d:”)scanf(“%d,%d,%d,%d”, &a,&b,&c,&d );if(a>b) { t=a;a=b;b=t; }if (a>c) {t=a;a=c;c=t;}if (a>d) {t=a;a=d;d=t;}if () {t=b;b=c;c=t;}if (b>d) {t=b;b=d;d=t;}if (c>d) {t=c;c=d;d=t;}printf(“%d,%d,%d,%d”,a,b,c,d);}