Conditional Flow Control Structures in C
There may be a situation where we have to choose one of the alternative paths depending upon the result of some condition. Condition is an expression evaluating to true or false. This is know as Decision-making statement.
There are different forms of decision making control structure:
- if
- if – else
- Nested-if
- Switch
[1] if statement
if statement is the most basic decision making statement. If the condition is true then the next statement or the statements inside the parenthesis are executed.
Syntax
| if (condition) { statement; } |
| Example if(n>0) printf(“Number is positive”); |
[2] if-else statement
If the condition is true then the next statement or the statements inside the parenthesis are executed or the else part is executed.
Syntax
| if (condition) { statement; } else { statement; } |
| Example if(n>0) printf(“Number is positive”); else printf(“Number is negative”); |
[3] Nested if statement
Nested if statements mean an if statement inside another if statement.
Syntax
| if (condition) { if (condition) {statement;} else{ statement;} } else { if (condition) {statement;} else{ statement;} } |
| Example if (a != b) { printf(“a is not equal to b\n”); //Nested if else if (a > b) { printf(“a is greater than b\n”); } else { printf(“b is greater than a\n”); } } else { printf(“a is equal to b\n”); } |
[4] Switch statement
This control statement allows us to make a decision from the number of choices is called as Switch case statement. It is a multi-way decision making statement.
Syntax
| switch(expression) { case value1: block1; break; case value1: block1; break; case value1: block1; break; . . . default: default statement; } |
| Example switch(ch) { case ‘a’: case ‘A’: case ‘e’: case ‘E’: case ‘i’: case ‘I’: case ‘o’: case ‘O’: case ‘u’: case ‘U’: printf(“Vowel”); break; default: printf(“Consonant”); } |
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also see
| C Programming language |
Go Programming language |
| Linked List | Array |
| Simplification | Queue |
| DBMS | Reasoning |
| Aptitude | HTML |
