int main(void)
{
int a,b,sum,i
printf("整数 a:")
scanf("%d",&a)
printf("整数 b:")
scanf("%d",&b)
for(i=b,sum=0i<=a++i)
{
sum+=i
}
printf("大于等于%d小于等于%d的所有整数和是%d。\n",b,a,sum)
return 0
}
int search(int v[], int idx[], int key, int n){
int num
for (int i = 0 i < n i++)
{
if (v[i] == key)
{
idx[i] = i
num++
}
}
return num
}
int main(){int num
int dig
int tmp
do{
printf("请输入一个非负整数：")
scanf("%d",&num)
if(num<0)
puts("\a请不要输入非负整数。")
}while(num<0)
dig = 0
tmp = num
do{
num = num/10
dig = dig+1
}while(num>0)
printf("%d的位数是：%d\n",tmp,dig)
return 0
}
就是设置一个变量记录一下num的值
