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### C-06

1. 1. Lecture 6 Version 1.0 The for Loop The break Statement The continue Statement Version 1.0
2. 2. Rushdi Shams, Dept of CSE, KUET, Bangladesh2 The for Loop  The for loop allows us to specify three things in a single line: 1. Setting a loop counter to an initial value. 2. Testing the loop counter to determine whether its value has reached the number of repetitions desired. 3. Increasing/decreasing the value of loop counter each time the program segment within the loop is executed.
3. 3. Rushdi Shams, Dept of CSE, KUET, Bangladesh3 General form of for loop
4. 4. Rushdi Shams, Dept of CSE, KUET, Bangladesh4 Example of for loop  This program prints number 1 to 10
5. 5. Rushdi Shams, Dept of CSE, KUET, Bangladesh5 Structure of for loop
6. 6. Rushdi Shams, Dept of CSE, KUET, Bangladesh6 Variation of for loop
7. 7. Rushdi Shams, Dept of CSE, KUET, Bangladesh7 Variation of for loop
8. 8. Rushdi Shams, Dept of CSE, KUET, Bangladesh8 Variation of for loop
9. 9. Rushdi Shams, Dept of CSE, KUET, Bangladesh9 Variation of for loop: Infinite loop
10. 10. Rushdi Shams, Dept of CSE, KUET, Bangladesh10 Observing for loops The initialization, loop-continuation condition and increment/decrement can contain arithmetic expressions. Assume that x=2 and y=10. The statement- for(j=x; j<=4*x*y; j=j+y/x) is equivalent to- for(j=2; j<=80; j=j+5)
11. 11. Rushdi Shams, Dept of CSE, KUET, Bangladesh11 Observing for loops There can be a decrement as well (or you can say a negative increment). For example-
12. 12. Rushdi Shams, Dept of CSE, KUET, Bangladesh12 Observing for loops If the loop continuation condition is initially false, the body portion of the loop is not performed.
13. 13. Rushdi Shams, Dept of CSE, KUET, Bangladesh13 Observing for loops
14. 14. Rushdi Shams, Dept of CSE, KUET, Bangladesh14 Qs
15. 15. Rushdi Shams, Dept of CSE, KUET, Bangladesh15 Nested for loops
16. 16. Rushdi Shams, Dept of CSE, KUET, Bangladesh16 Output
17. 17. Rushdi Shams, Dept of CSE, KUET, Bangladesh17 What will be the output?
18. 18. Rushdi Shams, Dept of CSE, KUET, Bangladesh18 What will be the output?
19. 19. Rushdi Shams, Dept of CSE, KUET, Bangladesh19 The break Statement  We often come across situations where we want to jump out of a loop instantly, without waiting to get back to the conditional test.  The keyword break allows us to do this.
20. 20. Rushdi Shams, Dept of CSE, KUET, Bangladesh20 The break Statement  When break is encountered inside any loop, control automatically passes to the first statement after the loop.
21. 21. Rushdi Shams, Dept of CSE, KUET, Bangladesh21 The break Statement
22. 22. Rushdi Shams, Dept of CSE, KUET, Bangladesh22 The continue Statement  In some programming situations we want to take the control to the beginning of the loop, bypassing the statements inside the loop, which have not yet been executed.
23. 23. Rushdi Shams, Dept of CSE, KUET, Bangladesh23 The continue Statement  The keyword continue allows us to do this. When continue is encountered inside any loop, control automatically passes to the beginning of the loop.
24. 24. Rushdi Shams, Dept of CSE, KUET, Bangladesh24 The continue Statement