c - C 编程中变量过多导致的错误

Question

我想计算正数和负数的算术平均值，用户给出数字。我想再放两个变量来计算正数和负数的总和，然后进行算术平均值。

但是当我将它们放入int x=0, q=0;时，程序将停止工作，编译器不会出现任何错误。为什么？

int total, i, numere[total], negativeSum = 0, positiveSum = 0;

printf("The number of digits you want to calculate the arithmetic amount: : ");
scanf("%d",&total);

for(i=0; i<total; i++){
    printf("Enter number %d : ",(i+1));
    scanf("%d",&numere[i]);
}

for(i=0; i<total ; i++){
   if(numere[i] < 0){
     negativeSum += numere[i];
            }else{
     positiveSum += numere[i];
   }
}

Answer 1

在你的陈述序列中

int total, i, numere[total], negativeSum = 0, positiveSum = 0;

printf("The number of digits you want to calculate the arithmetic amount: : ");
scanf("%d",&total);

total 仍未初始化，因此 numere[total] 未定义。编译器可能会完全删除它。为了让 total 初始化来定义 numere，您必须在阅读 total 后声明它:

int total, i, negativeSum = 0, positiveSum = 0;

printf("The number of digits you want to calculate the arithmetic amount: : ");
scanf("%d",&total);

int numere[total]; // now it is well-defined.