如何修复 C 程序中的编译错误 "WinMain"?

How to fix compilation error "WinMain" in a C program?

有3个文件- 1.atm.c(源文件) 2.transactions.h(函数声明) 3.transactions.c(定义函数) 当我编译(GCC)时,我收到 WinMain 错误。

而且我尝试了所有我知道的方法,我可以编译程序。 例 1: gcc -o atm.c transactions.c transactions.h //atm.c 以这种方式被删除。

Ex 2:as 我已经在源代码中包含了文件(.h)所以我没有在编译时给出.h: gcc -o atm.c transactions.c //在这种情况下,文件没有被删除,而是出现 WinMain 错误。

** 输出:**

gcc -o atm.c transactions.c transactions.h
C:/crossdev/src/mingw-w64-v4-git/mingw-w64-crt/crt/crt0_c.c:18: undefined reference to `WinMain'
collect2.exe: error: ld returned 1 exit status

atm.c:

#include "transactions.h"
int main(void) {

    initializeAccount();
    getBalance();

    //Perform first transaction
    askCustomer();
    updateAccount(amount);
    getBalance();

    //Perform second transaction
    askCustomer();
    updateAccount(amount);
    addGift(5.0);
    getBalance();

    //Perform third transaction
    askCustomer();
    updateAccount(amount);
    addGift(2.0);
    getBalance();
    thankYou();
    return EXIT_SUCCESS;
}

transactions.h:

#include <stdio.h>
#include <stdlib.h>
#ifndef TRANSACTIONS_H_
#define TRANSACTIONS_H_

float accountBalance, amount;

void initializeAccount();
void getBalance(void);
void askCustomer(void);
void updateAccount(float value);
void addGift(float giftAmount);
void thankYou(void);

#endif 

transactions.c :

#include <stdio.h>
#include <stdlib.h>


float accountBalance, amount;


void initializeAccount(void){
    accountBalance = 0.0;
}

void addGift(float giftAmount){
    accountBalance += giftAmount;
    printf("A gift of $%.2f has been added to your \n",giftAmount);      
}

void askCustomer(void){
    printf("Next transaction please...\n");
    printf("Enter amount to credit (positive) or debit (negative):");
    scanf("%f",&amount);
}

void getBalance(void){
    printf("\ncurrent balance is $%.2f\n",  accountBalance);
}

void updateAccount(float amount){
    accountBalance += amount;
    printf("The account was updated with $%.2f\n",amount);
}

void thankYou(void){
    printf("------  Thank you!  ------");
}

-o 用于命名二进制可执行文件,它是程序的 output。它后面应该跟一个文件名。

您告诉 gcc 链接的可执行文件应命名为 atm.c。这是不正确的,但也会导致该文件无法编译或链接。

一种正确编译的方法:

gcc -std=c99 atm.c transactions.c -o atm.exe