我一直收到一个关于malloc的错误,我正试图找出如何在头中不使用stdlib.h的情况下让这段代码工作。只是stdio.h,这可能吗?怎么可能?我完全糊涂了

#include <stdio.h>

void allocate(int* score_array, const int input)
{
    int iter;

    for(iter = 1;iter <= 11;++iter)
    {
        if( (input < iter*10) && (input >= (iter-1)*10 ) )
        {
            ++(score_array[iter-1]);
        }
    }
}

void printf_star(const int len)
{
    int iter;

    for(iter = 0;iter < len;++iter)
    {
        printf("*");
    }

    printf("\n");
}

int main()
{
    int iter, size, temp;
    int* buffer;
    int score_array[11];

    for(iter = 0;iter < 11;++iter)
    {
        score_array[iter] = 0;
    }

    printf("How many grades will you be entering?\n");
    printf("Enter a number between 1 and 100: ");
    scanf("%d", &size);

    buffer = (int*)malloc(size*sizeof(int));

    for(iter = 1;iter <= size;++iter )
    {
        printf("Getting grade %d. You have %d grade(s) left to enter\n", iter, size-iter+1);
        printf("Enter a number between 0 and 100: ");
        scanf("%d",&temp);

        if( (temp>=0) && (temp <= 100) )
        {
            buffer[iter-1] = temp;
        }
        else
        {
            do
            {
                printf("Invalid Value!\n");
                printf("Getting grade %d. You have %d grade(s) left to enter\n", iter, size-iter+1);
                printf("Enter a number between 0 and 100: ");
                scanf("%d",&temp);
            }
            while( (temp < 0) || (temp > 100) );
        }
    }

    for(iter = 1;iter <= size;++iter)
    {
        allocate(score_array, buffer[iter-1]);
    }

    for(iter = 0;iter < 11;++iter)
    {
        printf_star(score_array[iter]);
    }

    return 0;
}

我一直有这个错误:
hw08.c: In function ‘main’:
hw08.c:56: warning: incompatible implicit declaration of built-in function ‘malloc’

最佳答案

这只是一个警告,不是一个实际的错误,所以程序仍然可以编译。
要消除警告,可以在文件中声明malloc:

#include <stdio.h>
extern void * malloc(unsigned long);

你也可以加入stdlib.h,除非你有一个重要的理由不这么做。

关于c - 我如何在不使用stdlib.h的情况下执行此代码,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/43787270/

10-15 14:23