Find the length of the integer array first, define an identifier, change the value of this identifier if it is less than 0 when traversing the array, and judge after traversing. If there is no change, prove that all the numbers in the array are greater than 0.

When writing a program, you should have an idea first, and don't type all the code at once. After clearing your mind first, the rest is to translate your ideas into C language.