c语言--部分循环摘录2

//a =1 b=0
//a = 1 b=1
//a= 2 b=1
//
////比如：
////输入 3输出为
//
//1
//2
//3
//
//输入 4 输出为
//1
//2
//3
//5

int main(int argc,const char *argv[])
{
    int a=1,b=0;
    int num;
    scanf("%d", &num);
    for (int i=0; i<num; i++) {
        printf("%d\n", a+b);
        int temp = a;
        a = a+b;
        b = temp;
    }
    return 0;
}

//比如：
//
//输入 3输出为
//a = 1 b= 1
//2/1   a=2 b =1
//3/2   a=3 b =2
//5/3   a=5 b =3
//
//输入 4 输出为
//2/1
//3/2
//5/3
//8/5
int main(int argc, const char * argv[]) {
    int a=1;
    int b=1;
    int num;
    scanf("%d", &num);
    
    for (int i=0; i<num; i++) {
        printf("%d/%d\n", a+b, a);
        int temp = a;
        a= a+b;
        b = temp;
    }
    return 0;
}

//输入：2
//输出：
//3
//
//输入：3
//
//输出:
//9
//6! = 6*5! = 6*5*4!;
//Sn = 1!
//Sn = 1! + 2*Sn

int main(int argc,const char *argv[])
{
    int n;
    int sum = 0;
    int temp=1;
    scanf("%d", &n);
    for (int i=1; i<=n; i++) {
        temp *=i;
        sum += temp;
    }
    printf("sum = %d\n", sum);
    
    return 0;
}