Control Structure in C
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This document discusses different statements in C that allow for decision making and looping. It describes the syntax and use of if statements, switch statements, the conditional operator, goto statements, while loops, do-while loops, and for loops. These statements allow a program to change execution order based on conditions, or repeat a block of code until a condition is met. Examples are provided to illustrate the logic flow for each statement type.
Control Structure in C
- 1. Made By: Neel Pradip Shah (13CP612) (130110107048) 1
- 2. There are some situations where one may have to Change the order of execution based on certain conditions OR Repeat a group of statements until certain conditions are satisfied. 2
- 3. For this, C supports some statements which are capable of decision making, they are: 1. If statement 2. Switch statement 3. Conditional Operator 4. Goto Statement 5. While loop 6. Do-While loop 7. For loop 3
- 4. Syntax if(test expression) { statement Block; } statement X; Test expression ? Statement - block Statement - X Next Statement TRUE FALSE ENTRY 4
- 5. Syntax if(test expression) { statement Block(true); } else { statement Block(false); } statement X; Test expression ? Statement - block Statement - X TRUE ENTRY Statement - block FALSE 5
- 7. It is used for an unconditional jump Syntax (forward jump) (backward jump) goto label; label: …………….. Statement; …………….. ……………… Label: ……………… Statement; goto label; Programmers avoid using this As this statement makes logic complicated and debugging is difficult. 7
- 8. An Entry Controlled loop Syntax while(test condition) { Body Of the Loop } 8
- 9. An Exit Controlled loop Syntax do { set of statements } while(condition); 9
- 10. An Entry Controlled Loop Syntax for(initialization ; test-condition ; increment) { BODY OF THE LOOP } 10
- 11. for(initialization ; test-condition ; increment) { BODY OF THE LOOP } 11
- 12. Entry True False Entry False True Test Condition Test Condition Body of The loop Body of The loop 12
- 13. a=10; for(a=10; a!=0; a--)a=10; for(a=10; a!=0; a--) while(a != 0)while(a != 0) {{ { printf(“%d”,a);{ printf(“%d”,a); }} printf(“%d”,a);printf(“%d”,a); a--;a--; }} a=10;a=10; dodo { OUTPUT : 10987654321{ OUTPUT : 10987654321 Printf(“%d”,a);Printf(“%d”,a); a--;a--; }} while(a!=0)while(a!=0) 13
- 14. ANSI C By E.Balagurusamy Programming With C By Byron S Gottfried 14
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