C Program — Control Flow
Control-flow statements decide which code runs and how often.
Control flow
- Selection Statements
- Iteration Statements
- Jump Statements
Selection Statements
Evaluate a condition as TRUE or FALSE to choose which block of code to run.
- If … else
- Switch case
Iteration Statements
Repeatedly run one or more statements. The condition is checked before each pass, and the loop stops only when it becomes FALSE (or on break).
- While
- Do while
- For loop
Jump Statements
- Break — stop and exit the loop.
- Continue — skip the rest of the current iteration and jump back to the start of the loop for the next one.
Selection Statements
If … else
If _ Flow chart
If _ Syntax
If … else _ Flow chart
If … else _ Syntax
Shorthand if … else _ Syntax
If … else if … else _ Flow chart
If … else if … else _ Syntax
Nested if _ Flow chart
Nested if _ Syntax
Switch
Switch _ Flow chart
Switch _ Syntax
Thinking
What does the program below output?
Termination conditions:
- Keeps running until there are no more
cases. - When it hits a
break, it jumps out immediately.
Iteration Statements
While
While _ Flow chart
While _ Syntax
Do while
Do while _ Flow chart
Do while _ Syntax
For loop
For loop _ Flow chart
For loop _ Syntax
- statement 1 : initialization
- statement 2 : conditional
- statement 3 : update
Nested loop
“Nested” means things wrapped layer by layer, like a bird’s nest. A nested loop is a while/for loop placed inside another while/for loop.
Midway Challenge
