求高手，c语言题目，随机输入一个数，范围100到1000.判断它是否是6和19的倍数。最好for语 C语言题目 编程 找出1000以内的所有”完数“，所谓”完数...
C\u8bed\u8a00\u7f16\u7a0b\u6c42100~1000\u4e4b\u95f43\u548c5\u7684\u6700\u5c0f\u516c\u500d\u6570#include
void mian()
{
int i;
for(i=100;i<=1000;i++)
{
if((i%3==0)&&(i%5==0))
{
printf("%d",i);
break;
}
}
}
#include
int main()
{
int i,j,s;
for(i=2;i<=1000;i++)
{
s=1;
for(j=2;j<=i/2;j++)
if(i%j==0)s+=j;
if(s==i)printf("%d\n",i);
}
getch();
return 0;
}
#include<stdio.h>
void main(){
int num;
printf("请输入一个100到1000之间的数:");
scanf("%d",&num);
for(;;){
if(num>=100&&num<=1000){
break;
}else{
printf("必须输入一个100到1000之间的数!\n\n");
printf("请输入一个100到1000之间的数:");
scanf("%d",&num);
}
}
if(num%6==0&&num%19==0){
printf("这个数是6和9个倍数！");
}esle{
printf("这个数不是6和9个倍数！");
}
}
srand()置随机种子后rand()产生随机数，最后判断就行了
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