How c program execute in c program

To type your C program you need a program called Editor Example: Notepad Notepad++ or any IDE

Once the program has been typed it needs to be converted to machine language (0s and 1s) before the machine can execute it .

To carry out this conversion we need another program called Compiler. Compiler vendors provide an Integrated Development Environment (IDE) which consists of an Editor as well as the Compiler. Compiler Example: gcc IDE Example: Turbo C, Visual C++ , Borland C++

Write down program in IDE and save it with extension(.c) example: program_name.c

1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. }

Compile Completed no error is detected and object file also created Example: program_name.obj

1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. } Main Memory Memory Address 102543 142586 135545 135487

It is a preprocessor command 1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. } Main Memory Memory Address 102543 142586 135545 135487

It is the main function where the program execution begins 1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. } Main Memory Memory Address 102543 142586 135545 135487

First open brace of main function 1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. } Main Memory Memory Address 102543 142586 135545 135487

Memory allocation for three variable a,b,c 1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. } Memory int a int c Main Memory int b Address 102543 142586 135545 135487

printf(...) is a function which is use to show any message to the user 1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. } Memory int a int c Main Memory int b Address 102543 142586 135545 135487

User’s console or cmd message to the user Enter two numbers to add

scanf(...) is another function available in C which is use to take value form user by keyboard 1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. } Memory int a int c Main Memory int b Address 102543 142586 135545 135487

User’s console or cmd give the value of a=6 and b=5 Enter two numbers to add 6 5

Insertion of a and b in memory 1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. } Memory int a int c Main Memory int b Address 102543 142586 135545 135487

Insertion of a and b in memory 1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. } Memory 6 int c Main Memory 5 Address 102543 142586 135545 135487

Arithmatic addition operation 1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. } Memory 6 int c Main Memory 5 Address 102543 142586 135545 135487

Arithmetic Addition Operation 6 5 =+ 11

Arithmetic addition operation 1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. } Memory 6 11 Main Memory 5 Address 102543 142586 135545 135487

printf(...) is a function which is use to show any message to the user.It shows the value of c variable to the user. 1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. } Memory Main Memory Address 102543 142586 135545 135487 6 11 5

User’s console or cmd give the value of c = 11 (answer) Enter two numbers to add 6 5 Sum of entered numbers = 11 Press any key to continue . . .

It says that it is terminates the main() function and returns the value 0. 1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. } Memory Main Memory Address 102543 142586 135545 135487 6 11 5

last close brace of main function 1. #include<stdio.h> 2. int main() 3. { 4. int a, b, c; 5. 6. printf("Enter two numbers to addn"); 7. scanf("%d%d",&a,&b); 8. 9. c = a + b; 10. 11. printf("Sum of entered numbers = %dn",c); 12. 13. return 0; 14. } Memory Main Memory Address 102543 142586 135545 135487 6 11 5

How c program execute in c program

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