Else-If
Part of the Fundamentals section of Coddy's C journey — lesson 27 of 63.
The else-if statement allows you to check multiple conditions in sequence. When the first if condition fails, it moves to check the next else-if condition, and so on.
Start with a basic if statement:
if (grade >= 90) {
printf("A grade\n");
}Add an else-if to check another condition:
if (grade >= 90) {
printf("A grade\n");
} else if (grade >= 80) {
printf("B grade\n");
} else if (grade >= 70) {
printf("C grade\n");
}Finally, you can add an else statement at the end to handle all other cases:
if (grade >= 90) {
printf("A grade\n");
} else if (grade >= 80) {
printf("B grade\n");
} else if (grade >= 70) {
printf("C grade\n");
} else {
printf("Failed\n");
}
Challenge
EasyWrite a program that takes a temperature value and a character ('C' or 'F') indicating the scale. Based on the Celsius temperature, print one of the following messages:
- If temperature < 0°C: "Freezing"
- If temperature is between 0°C and 20°C: "Cold"
- If temperature is between 21°C and 30°C: "Pleasant"
- If temperature > 30°C: "Hot"
If the input is in Fahrenheit, convert it to Celsius first using the formula: C = (F - 32) * 5/9.
Print the message exactly as shown above based on the temperature.
Cheat sheet
The else-if statement allows checking multiple conditions in sequence. When the first if condition fails, it moves to check the next else-if condition.
Basic else-if structure:
if (condition1) {
// code for condition1
} else if (condition2) {
// code for condition2
} else if (condition3) {
// code for condition3
} else {
// code for all other cases
}Example with grade checking:
if (grade >= 90) {
printf("A grade\n");
} else if (grade >= 80) {
printf("B grade\n");
} else if (grade >= 70) {
printf("C grade\n");
} else {
printf("Failed\n");
}Try it yourself
#include <stdio.h>
int main() {
int temperature;
char scale;
scanf("%d", &temperature);
scanf(" %c", &scale);
// Don't change above this line
// Write your code here
return 0;
}
Test yourselfThis lesson includes a short quiz. Start the lesson to answer it and track your progress.
All lessons in Fundamentals
3Operators
Arithmetic OperatorsModulo OperatorIncrement/DecrementAssignment OperatorsRelational OperatorsLogical Operators Part 1Logical Operators Part 2Logical Operators Part 3Recap Challenge