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How to use the if statement in C++
Onyejiaku Theophilus ChidaluOverview
The if statement in C++ is used to specify a block of code that will be executed if a condition provided is true.
Syntax
if (condition){
statement
}
The statement or command will execute provided the given condition is true.
Example
Let’s write a code using the if statement:
#include <iostream>
using namespace std;
int main() {
// creating a condition
if (2 > 1) {
// creating a statement/block of code to be executed
cout << "2 is greater than 1";
}
return 0;
}
Implementing the if statement
Explanation
- Line 6: We use the
ifstatement. We create a condition, if the number2is greater than1, the block of code or statement in line 9 should be executed. - Line 9: we create a statement or block of code to be executed provided that the condition in line 6 is
true.
We can also use the if statement to test variables.
Example
#include <iostream>
using namespace std;
int main() {
// creating variables
int x = 1;
int y = 2;
// creating condition
if (x < y) {
// statement/block of code to be executed
cout << "x is less than y";
}
return 0;
}
Using the if statement to test variables
Explanation
-
Line 6 and 7: We create integer variables
xandy. -
Line 10: We compare the values of
xandy. Ifyis greater thanxthen the condition istrue. -
Line 13: We create a statement or block of code to execute provided the condition given in line 10 is
true.
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