Control Structure in C
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Made By: Neel Pradip Shah (13CP612) (130110107048) 1
Transcript of Control Structure in C
Made By:Neel Pradip Shah (13CP612)(130110107048)
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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.
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For this, C supports some statements which are capable of decision making, they are:
1. If statement2. Switch statement3. Conditional Operator4. Goto Statement5. While loop6. Do-While loop7. For loop
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Syntax
if(test expression){
statement Block;
} statement X;
Test expression ?
Statement - block
Statement - X
Next Statement
TRUE
FALSE
ENTRY
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Syntax
if(test expression){ statement
Block(true);}else{ statement
Block(false);} statement X;
Test expression ?
Statement - block
Statement - X
TRUE
ENTRY
Statement - block
FALSE
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Syntax
switch(expression){ case value-1: block-1; break;case value-2: block-2; break;……………..……………..default block; break;}Statement - X
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It is used for an unconditional jumpSyntax(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.
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An Entry Controlled loop
Syntax while(test condition){
Body Of the Loop }
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An Exit Controlled loop
Syntaxdo{
set of statements}while(condition);
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An Entry Controlled Loop
Syntax
for(initialization ; test-condition ; increment) {
BODY OF THE LOOP }
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for(initialization ; test-condition ; increment)
{
BODY OF THE LOOP
}
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Entry
True
False
Entry
False
True
Test Condition
Test Condition
Body of The loop
Body of The loop
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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)
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ANSI C By E.Balagurusamy Programming With C By Byron S Gottfried
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