Tbgu のバックアップ(No.2)

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#include<stdio.h>
 
int main(void)
{
    return x;
}

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error.c: In function ‘main’:
error.c:5: error: ‘x’ undeclared (first use in this function)
error.c:5: error: (Each undeclared identifier is reported only once
error.c:5: error: for each function it appears in.)

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#include<stdio.h>
 
int main(void)
{
    int x;  // x の宣言を追加
 
    return x;  // x が未定義、ではなくなる
}