Oppiskele If-else Operator | Control Statements

The if-else statement is a staple in programming. It enables you to direct the flow of your program based on certain conditions.

The if-else structure is pretty straightforward:

main.c


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if (condition) {
    // Execute this block of code if condition is `true`
}
else {
    // Execute this block of code if condition is `false`
}

For example, suppose the temperature variable reads from a sensor, and you want a program that alerts when the temperature exceeds a set limit.

Main.c


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#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.

The if-else statement can be further expanded with else-if:

Main.c


              123456789101112131415161718192021
            
#include <stdio.h>

int main()
{
	int tempereture = 50; // In celsius

	if (tempereture > 50) { 
		printf("Temperature is high: %d degrees Celsius\n", tempereture); // First instruction
	}
	else if (tempereture > 100) { 
		printf("Temperature is so high: %d degrees Celsius\n", tempereture);// Second instruction
	}
	else if (tempereture > 150) {
		printf("Temperature is critically high: %d degrees Celsius\n", tempereture);// Third instruction
	}
	else {
		printf("Temperature is normal: %d degrees Celsius\n", tempereture); // Fourth instruction
	}

	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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The if-else statement is a staple in programming. It enables you to direct the flow of your program based on certain conditions.

The if-else structure is pretty straightforward:

main.c


              123456
            
if (condition) {
    // Execute this block of code if condition is `true`
}
else {
    // Execute this block of code if condition is `false`
}

For example, suppose the temperature variable reads from a sensor, and you want a program that alerts when the temperature exceeds a set limit.

Main.c


              1234567891011121314
            
#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.

The if-else statement can be further expanded with else-if:

Main.c


              123456789101112131415161718192021
            
#include <stdio.h>

int main()
{
	int tempereture = 50; // In celsius

	if (tempereture > 50) { 
		printf("Temperature is high: %d degrees Celsius\n", tempereture); // First instruction
	}
	else if (tempereture > 100) { 
		printf("Temperature is so high: %d degrees Celsius\n", tempereture);// Second instruction
	}
	else if (tempereture > 150) {
		printf("Temperature is critically high: %d degrees Celsius\n", tempereture);// Third instruction
	}
	else {
		printf("Temperature is normal: %d degrees Celsius\n", tempereture); // Fourth instruction
	}

	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.

Oliko kaikki selvää?

Kiitos palautteestasi!

Osio 4. Luku 1