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March 28, 2022 10:44 pm GMT
Original Link: https://dev.to/ahmedgouda/selection-and-iteration-in-c-37d4
Selection and Iteration in C
Selection Statements
Selection statements are used to choose among alternative actions.
if
if( Condition ){ Action;}
if(grade >= 60){ puts("Passed");}
if .. else
if(Condition){ Action_1;}else{ Action_2;}
if(grade >= 60){ puts("Passed");}else{ puts("Failed");}
if .. elseif
if(Condition_1){ Action_1;}else if(Condition_2){ Action_2;}else if(Condition_3){ Action_3;}else{ Action_4;}
if(grade >= 90){ puts("A");}else if(grade >= 80){ puts("B");}else if(grade >= 70){ puts("C");}else if(grade >= 60){ puts("D");}else{ puts("F");}
switch
switch(Condition){case 1: Action_1; break;case 2: Action_2; break;case 3: Action_3; break;default: Action_4; break;}
switch(mark){case 'A': puts("Student got excellent grade"); break;case 'B': puts("Student got very good grade"); break;case 'C': puts("Student got good degree grade"); break;case 'D': puts("Student got fair grade"); break;default: puts("Student should retake the exam"); break;}
Conditional Operator
This is the only C ternary operator. It is used in place where if .. else
can't.
Condition ? True Action : False Action;
grade >= 60 ? puts("Pass") : puts("Fail");//orputs(grade >= 60 ? "Pass" : "Fail");
Iteration Statements
An iteration statement (repetition statement or loop) allows you to specify that an action is to be repeated while some condition remains true.
while
while(Continuation_Condition){ Action;}
while(grade < 60){ puts("Retake the exam");}
do .. while
do{ Action;}while(Continuation_Condition);
do{ //do the action once at least before check the condition puts("Start the Exam");}while(grade < 60>);
for
for(Initialization; Continuation_Condition; Increment){ Action;}
for(int i = 1; i <= 10; i++){ printf("%d ", i);}
Iteration Types
- Counter-Controlled
- Sentinel-Controlled
Counter-Controlled Iteration
We know in advance exactly how many times the loop will be executed.
Sentinel-Controlled Iteration
We don't know in advance how many times the loop will be executed. We use sentinel value (flag value) to indicated "End of Data" entry.
Original Link: https://dev.to/ahmedgouda/selection-and-iteration-in-c-37d4
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