嵌套if-else语句合法的,这意味着可以使用一个if,else if在另一个 if 或 else if 声明里面中。
语法
嵌套if语句的语法如下:
if( boolean_expression 1) { // Executes when the boolean expression 1 is true if(boolean_expression 2) { // Executes when the boolean expression 2 is true } }
可以嵌套 else if...else在类似if语句的方式。
例子:
#include <iostream> using namespace std; int main () { // local variable declaration: int a = 100; int b = 200; // check the boolean condition if( a == 100 ) { // if condition is true then check the following if( b == 200 ) { // if condition is true then print the following cout << "Value of a is 100 and b is 200" << endl; } } cout << "Exact value of a is : " << a << endl; cout << "Exact value of b is : " << b << endl; return 0; }
当上述代码被编译和执行时,它产生了以下结果:
Value of a is 100 and b is 200 Exact value of a is : 100 Exact value of b is : 200