输入一个整数求此范围内的奇数并输出，为什么提示错误

# include<stdio.h>
int main(void)
{
    int a,x;
    printf("请输入数据:");
    scanf("%d",&x);
    printf("%d\n",x);
    for(a=1,a<=x,a++)
    {
        if(x%2==1)
        {
            printf("%d\n",a);
        }
        else
        {
            ;
        }
    }
    return 0;
}


//错误提示；
In function ‘main’:
8:21: error: expected ‘;’ before ‘)’ token
     for(a=1,a<=x,a++)
                     ^
8:21: error: expected expression before ‘)’ token

[此贴子已经被作者于2020-3-26 13:37编辑过]