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# Loops

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### Loops

1. 1. C Programming Language By: Yogendra Pal yogendra@learnbywatch.com Dedicated to My mother and Father
2. 2. t y Keep your notebook with you. Write important point and questions that comes in your mind Solve Mind band exercise. C Rewind when not clear Ask Questions by call or SMS or by mail Keep Watching Keep Learning THIS IS LOOPS 2
3. 3. Need • Consider a problem: – Write a program that print “Hello” 5 times. – One possible statement to solve this problem is : • printf(“Hello n Hello n Hello n Hello n Hello); – But what if we want to print “Hello” 1000 times? – We need a control structure that repeatedly execute the following statement. • printf(“n Hello);
4. 4. Decision statements • To change the control flow of a program we use: – Branching statements : cause one section of code to be executed or not executed, depending on a conditional clause. – Looping statements : used to repeat a section of code a number of times or until some condition occurs.
5. 5. Looping Statements • Allow the program to repeat a section of code any number of times untill some condition occures.
6. 6. Looping statements : 1 • while statement initial_statement; – General form: while(condition){ statement; while(condition) iteration_statement; statement; } • The program will repeatedly execute the statement inside the while until the condition becomes false (0)
7. 7. Problems • Write a program that print “Hello” 5 times. while(counter <= 5) printf(“Hello”); • This statement reads – “while counter is less than or equal to 5 print Hello ”
8. 8. Multiple Statements • Put all statements inside the curly { } braces. while(condition) { statement 1; statement 2; statement 3; }
9. 9. (I ++) or (++ I) • while (i++ < 10) – compare i with 10, – increment i. • while (++i < 10) – increment i, – compare i with 10.
10. 10. Problems • Write a program that print numbers from 1 to 100. • Write a program that print sum of 10 consecutive numbers, enter first number using keyboard. • Write a program that print all even numbers from 1 to 100. • Write a program to find the factorial value of any number entered through the keyboard.
11. 11. break statement • break statement: – Loops can be exited at any point through the use of a break statement. • Write a program that checks whether a given number is prime of not.
12. 12. continue statement • continue statement: – continue starts re-executing the body of the loop from the top. • Write a program that print numbers from 1 to 100 except the numbers that are divisible by 5 using continue statement.
13. 13. Nested while while(condition) while(condition) while(condition) { statement; while(condition) { statement; while(condition) } { } if(condition) statement; else statement; }
14. 14. Mind Bend Write a program that print all the numbers from 2 to 100 with the indication whether a number is prime of not. Output will be like: 2 : prime 3 : prime 4 : not prime
15. 15. Looping Statement : 2 • for statement • General form: for (initial_statement; condition; iteration_statement) body_statement; initial_statement; while(condition){ statement; iteration_statement; }
16. 16. Problems • Two numbers (x and y) are entered through the keyboard. Write a program to find the value of xy • Write a program that print numbers from 1 to 100 except the numbers that are divisible by 5 and 7. • Write a program to print all characters with their ASCII value. 16
17. 17. Looping Statement : 3 • do-while loop do{ statement1; statement2 }while(condition) • do-while run the statements at least once.
18. 18. Problems • Write a program that first take two numbers from user and then one operator (+, -, *, /, %) and print the result accordingly. • Now modify the above program that give an option to the user to repeat the operation again and again with different operator choosen by him.
19. 19. Mind Bend • Write a program that takes 10 floating-point numbers as a input from user and print the greatest number. • Write a program that take floating point number from user and print – ICE if it is less than 0. – WATER if it lies between 0 and 100. – STEAM if it is greater then 100. 19
20. 20. To get complete benefit of this tutorial solve all the quiz on www.learnbywatch.com For any problem in this tutorial mail me at yogendra@learnbywatch.com with the subject “C” For Other information mail at info@learnbywatch.com Keep Watching Keep Learning NEXT IS FUNCTIONS 20