C语言用编写:五位以内的正整数,求它是几位数,并逆序输出。答:void main(){ int a,b,c,d,e,x,m;printf("请输入一个五位以内的正整数:\n");scanf("%d",&x);e=x/10000;d=x%10000/1000;c=x%1000/100;b=x%100/10;a=x%10;if(x>99999||x<=0)printf("ERROR!\n");else if(x>9999){ m=5;printf("数字为%d位数,逆序为%d%d%d\n",m,...