DECISION MAKING STATEMENTS.pptx
- 1. DECISION MAKING STATEMENTS Prof. Yashoda M B Assistant Professor Computer Science (UG) Kristu Jayanti college Bengaluru
- 2. if Statement if- else Statement if-else ladder Nested if statement switch statement 17/11/2023 2 Kristu Jayanti College
- 3. if statement: Syntax 17/11/2023 3 Kristu Jayanti College
- 5. Algorithm: To check the number is positive. Step 1: Start Step 2: Read a number and store in the variable Num. Step 3: If the number stored in the variable Num is grater than 0, print “ The number is Positive”. Step 4: Stop 17/11/2023 5 Kristu Jayanti College
- 6. Example: C program to check the given number is positive. #include<stdio.h> #include<conio.h> void main() { int Num; clrscr(); printf(“enter a numbern”); scanf(“%d”,&Num); // if statement if(Num>0) printf(“The number is positive”); getch(); } 17/11/2023 6 Kristu Jayanti College
- 7. if-else statement: Syntax 17/11/2023 7 Kristu Jayanti College
- 9. Algorithm: To check the number is positive or negative. Step 1: Start Step 2: Read a number and store in the variable Num. Step 3: If the number stored in the variable Num is grater than 0 go to Step 4, otherwise, go to step 5. Step 4: print “ The number is Positive”. Goto Step 6. Step 5: Print “The number is Negative”. Step 6: Stop 17/11/2023 9 Kristu Jayanti College
- 10. Example: C program to check the given number is positive or negative. #include<stdio.h> #include<conio.h> void main() { int Num; clrscr(); printf(“enter a numbern”); scanf(“%d”,&Num); // if else ladder if(Num>0) printf(“The number is positive”); else printf(“The number is negative”); getch(); } 17/11/2023 10 Kristu Jayanti College
- 11. if-else ladder statement: Syntax // any if-else ladder starts with an if statement only if(condition1) { // statements } else if(condition2) { // this else if will be executed when condition in if is false and // the condition of this else if is true } .... // once if-else ladder can have multiple else if else { // at the end we put else } 17/11/2023 11 Kristu Jayanti College
- 13. Example: C program to check the given number is positive or negative. #include<stdio.h> #include<conio.h> void main() { int Num; clrscr(); printf(“enter a numbern”); scanf(“%d”,&Num); // if else ladder if(Num>0) printf(“The number is positive”); else if(Num<0) printf(“The number is negative”); else printf(“The number is zero”); getch(); 17/11/2023 13 Kristu Jayanti College
- 14. nested if statement: Syntax 17/11/2023 14 Kristu Jayanti College
- 16. Example: C program to check the given number is positive or negative. i) If positive, check whether if is odd or even ii) if negative, display its square. #include<stdio.h> #include<conio.h> void main() { int Num; clrscr(); printf(“enter a numbern”); scanf(“%d”,&Num); // reading a number if(Num>0) { printf(“The number is positive”); if(Num%2==0) //nested if printf(“The number is even”); else printf(“The number is odd”); } else { printf(“The number is positive”); printf(“The square of the number is %d”, Num*Num); } getch(); } 17/11/2023 16 Kristu Jayanti College
- 17. switch statement: Syntax switch(expression) { case value1: statement_1; break; case value2: statement_2; break; . . . case value_n: statement_n; break; default: default_statement; } 17/11/2023 17 Kristu Jayanti College
- 19. Example: C program to display the day on user’s choice using switch statement. #include<stdio.h> #include<conio.h> void main() { int choice; clrscr(); printf(“enter a choicen”); scanf(“%d”,&choice); // reading a number switch(choice) { case 1: printf(“It is Monday”); break; case 2: printf(“It is Tuesday”); break; case 3: printf(“It is Wednesday”); break; case 4: printf(“It is Thursday”); break; case 5: printf(“It is Friday”); break; case 6: printf(“It is Saturday”); break; case 7: printf(“It is Sunday”); break; default: printf(“Invalid choice”); } getch(); } 17/11/2023 19 Kristu Jayanti College