Detailed explanation of the usage of return in C language

The usage of return in C language is: 1. For functions whose return value type is void, you can use the return statement to end the execution of the function early; 2. For functions whose return value type is not void, the return statement The function is to return the execution result of the function to the caller; 3. End the execution of the function early. Inside the function, we can use the return statement to end the execution of the function early, even if the function does not return a value.

The return statement in C language is used to return the execution result of the function to the caller. It has the following main uses:

Functions with a return value type of void: For functions with a return value type of void, you can use the return statement to end the execution of the function early.

For example, we define a function named print_hello, whose return value type is void. Inside the function, we only print one sentence "Hello, World!", and then end the execution of the function:

#include <stdio.h>
void print_hello() {
    printf("Hello, World!\n");
    return; // 提前结束函数的执行
}

Functions whose return value type is not void: For functions whose return value type is not void, the function of the return statement is to return the execution result of the function to the caller.

For example, we define a function named add, whose return value type is int. The function internally receives two integer parameters and returns their sum:

#include <stdio.h>
int add(int a, int b) {
    int sum = a + b;
    return sum; // 将计算结果sum返回给调用者
}

When calling the add function When, you can assign the return value to a variable, as shown below:

#include <stdio.h>
int main() {
    int result = add(3, 5); // 调用add函数，并将返回值赋给result变量
    printf("The result is: %d\n", result);
    return 0;
}

End the execution of the function early: Inside the function, we can use the return statement to end the execution of the function early, Even if the function does not return a value.

For example, we define a function named print_numbers, whose return value type is void. A loop is used inside the function to print out all integers between 1 and 10. When 5 is printed, the function ends early. Execution:

#include <stdio.h>
void print_numbers() {
    for (int i = 1; i <= 10; i++) {
        printf("%d ", i);
        if (i == 5) {
            return; // 提前结束函数的执行
        }
    }
}

When calling the print_numbers function, only integers between 1 and 5 will be printed:

#include <stdio.h>
int main() {
    print_numbers(); // 调用print_numbers函数
    return 0;
}

To sum up, the return statement has the following main uses in C language: End the execution of the function early, return the execution result of the function to the caller, and end the execution of the function in a function with a return value type of void. By rationally using the return statement, the program can be made more flexible and efficient.

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