Lecture notes
Computer system
- Module
- Computer (COMPUTER)
- Institution
- PEARSON (PEARSON)
Computer system, computer science, computer skills, computer language
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if(b>a){
printf("b is greater");
}
}
Output
b is greater
#include <stdio.h>
int main()
{
int number;
printf("Enter an integer: ");
scanf("%d", &number);
// Test expression is true if number is less than 0
if (number < 0)
{
printf("You entered %d.\n", number);
}
printf("The if statement is easy.");
return 0;
}
Output 1
Enter an integer: -2
You entered -2.
The if statement is easy.
Output 2
Enter an integer: 5
The if statement in C programming is easy.
If-else statement : The if-else statement is an extension of the simple if statement. The
general form is. The if...else statement executes some code if the test expression is true (nonzero)
and some other code if the test expression is false (0).
C PROGRAMMING Page 60
, Syntax : if (condition)
{
true statement;
}
else
{
false statement;
}
statement-x;
If the condition is true , then the true statement and statement-x will be executed and if the
condition is false, then the false statement and statement-x is executed.
Or
If test expression is true, codes inside the body of if statement is executed and, codes inside the
body of else statement is skipped.
If test expression is false, codes inside the body of else statement is executed and, codes inside
the body of if statement is skipped.
Flowchart
Example:
// Program to check whether an integer entered by the user is odd or even
#include <stdio.h>
int main()
{
C PROGRAMMING Page 61
, int number;
printf("Enter an integer: ");
scanf("%d",&number);
// True if remainder is 0
if( number%2 == 0 )
printf("%d is an even integer.",number);
else
printf("%d is an odd integer.",number);
return 0;
}
Output
Enter an integer: 7
7 is an odd integer.
Nested if-else statement
When a series of decisions are involved, we may have to use more than on if-else statement in
nested form. If –else statements can also be nested inside another if block or else block or both.
Syntax : if(condition-1)
{ {
if (condition-2)
{
statement-1;
}
else
{
statement-2;
}
}
else
{
statement-3;
C PROGRAMMING Page 62
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