175035 cse lab-03
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This lab report summarizes an experiment on C control flow statements, including if, if-else, else if ladder, nested if, and switch statements. It provides code examples and explanations of each statement type. The objectives are to understand the working principles of each statement. The report describes each statement type, provides example code, and shows expected input/output. It concludes that this experiment taught important decision-making statements that will be useful for programming.
175035 cse lab-03
- 1. Lab Report Course ID: TE-3702 Course Title:-Computer Application and Programming (Sessional) Experiment No. 02 Name:-Introduction to C control flow (if, if-else, else if ladder, nested if, switch ). Submitted by Name : ID : Year and Semester : Session : Department : Mahbubay Rabbani 175035 3/1 2018-19 Textile Engineering Submitted to Khawja Imran Masud Lecturer Department of CSE Dhaka University of Engineering & Technology (DUET), Gazipur
- 2. Introduction:- It involves a number of conditions or parameters that determine one of the various written modules. Structures that use this type of reasoning are known as conditional structures.it contains 5 decision making statements:- 1. Simple if statement. 2. if-else statement. 3. else if ladder statement. 4. nested if else statement. 5. Switch statement. Objectives:- To know about simple if statement and its working principle. To know about if-else statement and its working principle. To know about else if ladder statement and its working principle. To know about nested if statement and its working principle. To know about switch statement and its working principle.
- 3. If statement When we need to execute a block of statements under a given condition then we use if statement. The statements inside the body of if only execute if the given condition is true. If the condition is false then the statements inside if are skipped that means not show in execute program. Program /*Simple if statement program */ #include <stdio.h> int main() {int x, y; printf("the value of x="); scanf("%d", &x); printf("the value of y="); scanf("%d", &y); if (x>y) printf("x is larger than yn"); if (x<y) printf("x is lower than yn"); if (x==y) printf("x is equal to yn"); return 0; }
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- 6. If else statement:- When the statements inside the body of if is true under a given condition then the statements are executed and the statements inside body of else are skipped. Again when the statements inside the body of if is false under a given condition then the statements are skipped and the statements inside body of else are executed. Program:- /*Simple if_else statement program */ #include <stdio.h> int main() { int x,y; printf("the value of x="); scanf("%d", &x); printf("the value of y="); scanf("%d", &y); if (x>y) printf("x is larger than yn"); else printf("x is lower than yn"); return 0; }
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- 9. else-if ladder statement :- When we need multiple if conditions for program execution then we use else if. In this case the statement which is true under the condition is shown and when any condition is true, then remaining conditions are not working. In this case the program contains a starting if and ending else and else if conditions are present between the starting if and ending else. Program:- /*else if ladder statement*/ #include <stdio.h> int main() { int marks; printf("the mark is="); scanf("%d",&marks); if(marks>=80) printf("the result is A+"); else if(marks>=70) printf("the result is A"); else if(marks>=60)
- 10. printf("the result is A-"); else if(marks>=50) printf("the result is B"); else if(marks>=40) printf("the result is C"); else printf("the result is F"); return 0; }
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- 13. nested if else statement:- Sometimes a program contains starting if condition and in this if contains again multiple if, else if and else conditions it is known as nested statement. Similar occurance is occurred for ending else conditions. Program:- /*nested if statement*/ #include<stdio.h> int main() { int num1,num2,num3; printf("enter the first number="); scanf("%d", &num1); printf("enter the second number="); scanf("%d", &num2); printf("enter the third number="); scanf("%d", &num3); if (num1>num2) { if (num2>num3) printf("the largest number is=%d",num1);
- 14. else printf("the largest number is=%d",num2); } if (num1<num2) { if (num2<num3) printf("the largest number is=%d",num3); else printf("the largest number is=%d",num2); } return 0; }
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- 17. Switch statement:- Switch statement is used when we choose a specific statement from multiple statement. When the statement is matched with the switch condition then the statement is printed and others are not printed here. If any statement can not match with any case then the default keyword is used. There are 4 keywords which are used in the switch statement and they are switch, break, case and default. Here the keyword case contains colon sign ( : ) Program :- #include<stdio.h> int main() { int num; printf("Enter a number for testing switch="); scanf("%d", &num); switch(num) { case 0: printf("zero"); break;
- 18. case 1: printf("one"); break; case 2: printf("two"); break; case 3: printf("three"); break; default: printf("this not valid number for your desirable spelling"); } return 0; }
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- 20. Output:- Conclusion:- From this experiment we have learn about C control flow which contains some decision making statement and their working principle which is very important for programming. I think it will help me a lot in practical life.