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C if else

The document discusses the if-else conditional statement in C programming. It provides the syntax and examples of using if-else statements to execute code conditionally based on whether an expression is true or false. This includes if-then statements with and without else blocks, multiway if-else statements, nested if statements, and examples checking the equality of variables and ranges of values.

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C if else Introduction:- The if statement is used to conditionally execute a statement or a block of statements. Conditions can be true or false, execute one thing when the condition is true, something else when the condition is false.
C if else Syntax:- if (expression) statement(s); [else statement(s);]
C if else Example :- if (a == b) printf ("%d is equal to %d", a, b); else printf ("%d is not equal to %d", a, b);
C if else If-then statements :- Syntax:- if (expression) statement(s);
C if else If-then statements :- Example:- if (a == b) printf ("%d is equal to %d", a, b); else printf ("%d is not equal to %d", a, b); Note : There is no indentation rule in writing C programming, we can write the above code in following ways :
C if else If-then statements :- Example:- if (a == b) printf ("if a is equal to b"); printf ("%d is equal to %d", a, b); if (a == b) { printf ("if a is equal to b"); printf ("%d is equal to %d", a, b); } Note : The second way of writing code is a good practice.
C if else A complete example on conditional if-else statement:- Example :- #include<stdio.h> main() { int num; printf("Input a number : "); scanf("%d",&num); if(num>0) { printf("This is a positive integern"); } else // else portion of if statement { printf(" This is not a positive integer..Try againn") ; } }
C if else A complete example on conditional if-else statement:- Example :- #include<stdio.h> main() { int num; printf("Input a number : "); scanf("%d",&num); if(num>0) { printf("This is a positive integern"); } else // else portion of if statement { printf(" This is not a positive integer..Try againn") ; } }
C if else Sequential if-then statements :- Example :- if (a == b) printf ("a = b"); if (a == c) printf ("a = c"); if (b == c) printf ("b = c")
C if else Multiway if-else-Statement :- syntax :- if (expression_1) statement_1 else if (expression_2) statement_2 . . . else if (expression_n) statement_n else other_statement
C if else Multiway if-else-Statement :- #include<stdio.h> main() Example :- { int num; printf("Input score :"); scanf("%d",&num); if (num>=90) { printf("Grade : Excellent"); } else if(num>=80 && num<90) { printf("Grade : Very Good"); } else if(num>=60 && num<80) { printf("Grade : Good"); } else if(num>=50 && num<60) { printf("Grade : Average"); } else if(num>=40 && num<50) { printf("Grade : Poor"); } else { printf("Grade : Not Promoted"); } }
C if else Nested if-then-else statements :- Example :- #include<stdio.h> main() { int num1=5, num2=3, num3=-12, min; if(num1<num2) { if(num1<num3) min = num1; else min = num3; } else { if(num2<num3) min = num2; else min = num3; } printf("Among %d, %d, %d minimum number is %d",num1 ,num2,num3,min); }