4📌

int main() {
   int a;
   int digits=0;

   printf("Enter a number:");
   scanf("%d",&a);
//以下两句写在循环外是为了处理“0”的情况，否则将会输出0位数
    digits++;
    a=a/10;

   while (a>0) {
     digits++;
       a=a/10;
 }
 printf("%d",digits);

    return 0;
}
//电脑中有数位限制，太大的数字不行

int main(){
    int a;
    int digits=0;
    printf("Enter a number:");
    scanf("%d\n",a);

    do{
        x=x/10;
        digits++;
    }while(a>0);

    return 0;
}

int main(){
    srand(time(0));
    int a =rand();
    printf("%d\n",a)
    return 0;
}
--------------------->
int main(){
    srand(time(0));
    int a =rand();
    //保证a在100以内
    a=a%100
    printf("%d\n",a)
    return 0;
}

int main() {
    int x;
    int sum=0;
    int count=0;
    int number[100];

    scanf("%d",&x);
    while(x!=-1) {
        number[count]=x;
        sum=sum+x;
        count++;
        scanf("%d",&x);
    }

    if(count>0){

        printf("The average of all numbers is %f\n", 1.0*sum/count);
        int i;
        printf("%d\t",number[i]);
        for(i=0;i<count;i++){

            if (number[i]>sum/count){
                printf("%d\n",number[i]);
            }
        }
    }
    return 0;
}

int main(){
    int  x;
    int  reverse=0;
    int  digits=0;
    printf("Enter a number:");
    scanf("%d",&x);

    while(x>0) {
        digits=x%10;
        x=x/10;
        reverse=reverse*10+digits;
        printf("%d,%d,%d\n",digits,x,reverse);//测试语句
    }
printf("The reverse is: %d",reverse);//逆序输出
return 0;
}