C语言实验报告8

195080410 李荪玮

T5

#include <stdio.h>
int main() {
    int n=1,count=1,result=0;
    while (n<=101){
        result+=n*count;
        count*=-1;
        n+=2;
    }
    printf("%d",result);
    return 0;
}

T6

#include <stdio.h>
float Process(int n){
    float result;
    result=1-1.0/(n+1);
    return result;
}
int main() {
    int n;
    scanf("%d",&n);
    printf("%f",Process(n));
    return 0;
}

T7

#include <stdio.h>
int isPrime(int n) {
    for (int i = 2; i < n; ++i) {
        if (n % i == 0)return 0;
    }
    return 1;
}
int main() {
    int count = 1,flag=0;
    for (int i = 1; i <= 100; ++i) {
        if (isPrime(i)){
            flag++;
            printf("%d ", count);
        }
        count++;
        if (flag == 10) {
            flag = 0;
            printf("\n");
        }
    }
    return 0;
}

T9

#include <stdio.h>
int fun(char *str) {
    int count = 0;
    while (*str != '\0') {
        if (*str >= '0' && *str <= '9')count++;
        str++;
    }
    return count;
}
int main() {
    char str[40];
    scanf("%s", str);
    printf("%d", fun(str));
    return 0;
}