如何解决错误：预期的标识符或'（' [英] How to solve error: expected identifier or '('

问题描述

我在编程时遇到问题。
我一遍又一遍地收到这个错误；

I've got a problem with something I'm programming. I get this error over and over;

jharvard@appliance (~/Dropbox/pset1): make mario
clang -ggdb3 -O0 -std=c99 -Wall -Werror    mario.c  -lcs50 -lm -o mario
mario.c:23:5: error: expected identifier or '('
    do
    ^
mario.c:32:1: error: expected identifier or '('
do
^
2 errors generated.

我在互联网上进行了搜索，但找不到问题..
在<$ c $之后删除了; c> int main（void）没有帮助

I searched all over the internet but couldn't find the problem.. removing the ; after int main(void) didn't help

这是我的代码：

#include <stdio.h>
#include <cs50.h>
#include <math.h>

int main(void);

    //Ask User for Height, and check

    int a, b, rows, height;
    int a = 0;
    int b = 0;
    int rows = 1;   

    do
    { 
        printf ("Height: ");
        height = GetInt();
    }
    while (height <=0 || height > 23);   

    //build half pyramid

    do
    {
        do
        {
            printf("r");
            a++;
        }
        while (a < height - rows);

        do
        {
            printf("#");
            b++;
        }
        while (b < rows + 1);


        printf("\n");
        rows++;

        while (rows <= height);
    }

我一直在努力解决这一问题，但我

I've been trying to solve this problem for a few days, but i just can't figure it out!

非常感谢！

推荐答案

您使用do / while嵌套了循环。确保每个以do开头都以while结束。

You got nested loop with do/while. Make sure that each start with do end with while.

就像文件末尾一样， while不正确。

Look like at the end of file, the "while" is not correct.

printf("\n");
rows++;

while (rows <= height);
}

这可能是您在 while（行< ; = height）;'

That could be you missing the close '}' before 'while (rows <= height);'

正确的代码可以是：

int main(void)
{

    //Ask User for Height, and check

    int a, b, rows, height;
    a = 0;                    // <- removed int
    b = 0;                    // <- removed int
    rows = 1;                 // <- removed int

    do
    { 
        printf ("Height: ");
        height = GetInt();
    }
    while (height <=0 || height > 23);   

    //build half pyramid

    do
    {
        do
        {
            printf("r");
            a++;
        }
        while (a < height - rows);

        do
        {
            printf("#");
            b++;
        }
        while (b < rows + 1);


        printf("\n");
        rows++;
    }                             // <- add }
    while (rows <= height);
}

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