在C语言中，变量的隐式初始化为0或1

We know that we need to declare variables before using it in our code. However, we variables can be assigned with 0 or 1 without declaration. In the following example we can see this.

Example

#include #include x, y, array[3]; // implicit initialization of some variablesint main(i) {   //The argument i will hold 1   int index;   printf("x = %d, y = %d
", x, y);   for(index = 0; index 
", i, array[i]);      printf("The value of i : %d", i);}

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Output

x = 0, y = 0Array[0] = 0Array[1] = 0Array[2] = 0The value of i : 1

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有时候，如果某个数组只初始化了一部分值，那么剩下的值会被设置为0。

#include #include int main() {   //The argument i will hold 1   int index;   int array[10] = {1, 2, 3, 4, 5, 6};   for(index = 0; index 
", index, array[index]);}

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Output

Array[0] = 1Array[1] = 2Array[2] = 3Array[3] = 4Array[4] = 5Array[5] = 6Array[6] = 0Array[7] = 0Array[8] = 0Array[9] = 0

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