Kursinhalt
C Basics
C Basics
If-else Operator
if-else
The if-else statement is a staple in programming. It enables you to direct the flow of your program based on certain conditions.
Note
Just a heads-up! Code blocks
{ }were introduced in Section 1, Chapter 2.
The if-else structure is pretty straightforward:
Take, for instance, the temperature variable that receives data from a temperature sensor.
Suppose we want a program that alerts us when the temperature gets too high:
Main
#include <stdio.h> int main() { int temperature = 200; // in celsius if (temperature > 80) { printf("Temperature is so high: %d degrees Celsius\n", temperature); } else { printf("Temperature is normal: %d degrees Celsius\n", temperature); } return 0; }
You can incorporate multiple if statements in a program, especially when you need to evaluate various conditions.
Note
Conditions can also include logical operators.
Else If
The if-else statement can be further expanded with else-if:
Main
#include <stdio.h> int main() { int tempereture = 50; // in celsius if (tempereture > 50) // condition 1 { printf("Temperature is high: %d degrees Celsius\n", tempereture); // instruction_1 } else if (tempereture > 100)// condition 2 { printf("Temperature is so high: %d degrees Celsius\n", tempereture);// instruction_2 } else if (tempereture > 150)// condition 3 { printf("Temperature is critically high: %d degrees Celsius\n", tempereture);// instruction_3 } else { printf("Temperature is normal: %d degrees Celsius\n", tempereture); // instruction_4 } return 0; }
1. What is the purpose of an if-else statement in programming?
2. What is a basic structure of an if-else statement in C, including the syntax for code blocks.
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Abschnitt 4. Kapitel 1
