Usage of return,break,continue in C + +

References: 51315835

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The return statement is used to end the currently executing function and return control to the function that called the function.    The return statement has two forms: return value and no return value, return; return x;

First: For use without return values, return statements without return values can only be used to return a function with a type void, and the return statement is intended to cause a forced end of the function, which is similar to the effect of a break statement in a looping structure.

Second: For the use of the return value, it cannot be used for a function of type void, otherwise an error

1. Function of Return statement(1) return exits from the current method and returns to the statement of the method that is called to continue execution. (2) return returns a value to the statement that invokes the method, and the data type of the return value must match the type of the return value in the declaration of the method. (3) return back can also be without parameters, without parameters is returned empty, in fact, the main purpose is to interrupt the function execution, return to the calling function. 2. The effect of the break statement(1) break in the loop body, forcibly end the execution of the loop, that is, the end of the entire cycle, not to determine whether the condition of the execution loop is established, directly to the statement below the circular statement. (2) When break appears in the body of the switch statement in the loop body, its function is simply to jump out of the switch statement body. the role of 3.continue statementsterminates the execution of this loop, that is, the statement that has not been executed after the continue statement in the current loop is skipped, and then the next cycle condition is judged. below you can see the specific example, may be more clear:

2. #include <stdio.h>
   
4. int main ()
   
6. {
   
8. int i = 5,n = 0;
   
10. while (i--)
    
12. {
    
14. if (i = = 3)
    
16. Return
    
18. Break
    
20. Continue
    
22. else if (i = = 1)
    
24. n = 6;
    
26. }
    
28. n = n + 5;
    
30. printf ("i=%d\n", I);
    
32. printf ("n=%d\n", N);
    
34. return 0;
    
36. }

When you run continue , the result is:

1. I=-1
   
2. n=11

When you run break, the result is:

1. I=3
   
2. N=5

When you run return , there is no result, stating that the main function was brought out when I==3 was executed, and the following statement will not be executed (no print operation will be performed)

Usage of return,break,continue in C + +