Example 1: if statement // Program to display a number if it is negative#include<stdio.h>intmain(){intnumber;printf("Enter an integer: ");scanf("%d", &number);// true if number is less than 0if(number <0) {printf("You entered %d.\n", number); }printf("The if statement is ...
Mechanism of if-else statement in C Initiated by the “if” keyword, the statement is enclosed in parentheses containing an evaluative condition, typically a Boolean expression capable of being true or false. When the condition enclosed within the parentheses is assessed as true, the code snippet...
The following are examples of theifstatement: C if( i >0) y = x / i;else{ x = i; y = f( x ); } In this example, the statementy = x/i;is executed ifiis greater than 0. Ifiis less than or equal to 0,iis assigned tox, andf( x )is assigned toy. The statement forming...
/*If Statements*/ if(conditional-expression) { then-clause } /*If-Else Statements*/ if(conditional-expression) { then-clause } else{ else-clause } /*Switch Statements*/ switch(control-expression) { caseconstant-expression-
if(判断条件){ 语句块1 }else{ 语句块2 } 意思是,如果判断条件成立,那么执行语句块1,否则执行语句块2 。其执行过程可表示为下图: 所谓语句块(Statement Block),就是由{ }包围的一个或多个语句的集合。如果语句块中只有一个语句,也可以省略{ },例如: ...
if语句后面可以跟一个可选的else语句,该语句在布尔表达式为false时执行。 语法(Syntax) C编程语言中if...else语句的语法是 - if(boolean_expression) { /* statement(s) will execute if the boolean expression is true */ } else { /* statement(s) will execute if the boolean expression is false *...
OR: Very useful is the OR statement! If either (or both) of the two values it checks are TRUE then it returns TRUE. For example, (1) OR (0) evaluates to 1. (0) OR (0) evaluates to 0. The OR is written as || in C++. Those are the pipe characters. On your keyboard, they...
1.if、if...else语句 if语句被称为分支语句(Branching statement)或选择语句(selection statement)。 1.1if和if...else常见形式 一般形式1 if(expression)statement// 如果expression为真,则执行statement部分。 一般形式2 if(expression)statement01elsestatement02// 如果expression为真,执行statement01部分,否则,执行...
if (expression)statementelsestatement 在两种形式的if语句中,将计算可具有结构之外的任何值的表达式(包括所有副作用)。 在第一种形式的语法中,如果expression为 true(非零),则执行statement。 如果expression为 false,则忽略statement。 在第二种形式的语法(使用了else)中,如果expression为 false,则执行第二个statement...
if (Boolean expr){ Expression; . . . } else{ Expression; . . . } The C compiler evaluates the condition, and executes a statement or a block of statements following the if statement if it is true.If the programming logic needs the computer to execute some other instructions when the ...