C语言练习2

Posted 2020-07-23 新起点1

 

 

#include <stdio.h>
int main(void)
{
    long sum=0L;
    int count =0;
    int i,j;这个地方必须把它全局声明。这样才不会出现一个叫做   ：只允许在 C99 模式下使用‘for’循环初始化声明   的错误。

    printf("\nEnter  the number of integers you wnat to sum:");
    scanf("%d",&count);

    for(i=1;i<=count;i++)
    {
        sum=0L;
    
        for (j=1;j<=i;j++)
            sum+=j;

    
    printf("\n%d\t%ld",i,sum);
    }
    system("pause");
    return 0;

}

 

 

#include <stdio.h>
int main(void)
{
    long sum=0L;
    int count =0;
    int i,j=1;

    printf("\nEnter  the number of integers you wnat to sum:");
    scanf("%d",&count);
    
    for (i=1;i<=count;i++)
    {

    sum=1L;
    printf("\n1");
    

    while (j<i)
    {
    
        sum+=++j;
        printf("+%d",j);
    
    }
    printf("=%ld\n",sum);
    }
    system("pause");
    return 0;
    
}