生成一段C语言代码,输入正整数n(n>100),输出[3,n]上质数的个数。输入无效时输出0
时间: 2024-05-12 10:18:05 浏览: 94
以下是符合要求的C语言代码:
```c
#include <stdio.h>
int isPrime(int num) {
if (num < 2) {
return 0;
}
for (int i = 2; i * i <= num; i++) {
if (num % i == 0) {
return 0;
}
}
return 1;
}
int main() {
int n;
printf("请输入正整数n(n>100):");
scanf("%d", &n);
if (n <= 100) {
printf("输入无效,输出0");
return 0;
}
int count = 0;
for (int i = 3; i <= n; i++) {
if (isPrime(i)) {
count++;
}
}
printf("[3, %d]上质数的个数为:%d", n, count);
return 0;
}
```
请注意,此代码仅供参考,可能存在错误和不足之处,建议仔细检查和测试。
相关问题
c语言程序,输入正整数n,输出n以内的全部素数,并输出n以内所有素数的个数
您好,很高兴为您解答问题!
以下是C语言程序,可以输入正整数n,输出n以内的全部素数,并输出n以内所有素数的个数:
```c
#include <stdio.h>
#include <stdbool.h>
bool is_prime(int n) {
if (n <= 1) {
return false;
}
for (int i = 2; i < n; i++) {
if (n % i == 0) {
return false;
}
}
return true;
}
int main() {
int n, count = 0;
printf("请输入一个正整数n:");
scanf("%d", &n);
printf("%d以内的全部素数是:", n);
for (int i = 2; i <= n; i++) {
if (is_prime(i)) {
printf("%d ", i);
count++;
}
}
printf("\n%d以内的素数个数是:%d", n, count);
return 0;
}
```
希望能对您有所帮助!如果您有其他问题,请随时提出。
C语言编写程序:输入正整数n及n个正整数,统计并输出n个正整数中质数的个数。
在C语言中,要编写一个程序来统计并输出给定正整数n中的质数个数,你可以遵循以下步骤:
1. 首先,创建一个函数来判断一个数是否为质数。通常,质数是大于1的自然数,除了1和它自身以外没有其他因数。可以设置一个嵌套循环,从2遍历到该数的平方根,如果存在因子,则不是质数。
```c
int is_prime(int num) {
if (num <= 1) {
return 0;
}
for (int i = 2; i * i <= num; i++) {
if (num % i == 0) {
return 0;
}
}
return 1;
}
```
2. 然后,在主函数里,读取用户输入的n,初始化一个计数器变量用于记录质数的数量,并通过一个for循环依次检查每个输入的数字,如果是质数就增加计数器。
```c
#include <stdio.h>
int main() {
int n, count = 0;
printf("请输入正整数n: ");
scanf("%d", &n);
for (int i = 0; i < n; i++) {
int input;
printf("请输入第%d个正整数: ", i + 1);
scanf("%d", &input);
if (is_prime(input)) {
count++;
}
}
printf("在%d个数中有%d个是质数。\n", n, count);
return 0;
}
```
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