为什么我的输出显示两倍于我输入的限制？

Question

Write a C program to print all even numbers between 1 to 100. - using while loop

#include<stdio.h>

int main(int argc, char const *argv[])
{
    int a=0,Even,Go;

    printf("Enter the Value:\n");
    scanf("%d",&Go);
    
    while(a<=Go)
    {
        Even=a*2;
        printf("%d\t",Even);
        a++;
    }


    return 0;
}

OutPut:

Enter the Value:
20
0       2       4       6       8       10      12      14      16      18      20      22      24      26       28      30      32      34      36      38      40      %     

Answer 1

As pointed out in the comments, your while condition is not based on the numbers that you're printing. You're testing the number and then doubling it when printing.

Instead, you can simply increment by 2 so you test the same numbers you're printing.

Since the numbers should be between 1 and Go , you should initialize a to 2 rather than 0 .

#include<stdio.h>

int main(int argc, char const *argv[])
{
    int a=2,Even,Go;

    printf("Enter the Value:\n");
    scanf("%d",&Go);
    
    while(a<=Go)
    {
        printf("%d\t",a);
        a += 2;
    }

    return 0;
}