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

2. int main()
3. {
4. int a, b, c;
5.
7. scanf("%d%d",&a,&b);
8.
9. c = a + b;
10.
12.
13. return 0;
14. }
Main Memory
Memory Address
102543
142586
135545
135487

It is a preprocessor command
2. int main()
3. {
4. int a, b, c;
5.
7. scanf("%d%d",&a,&b);
8.
9. c = a + b;
10.
12.
13. return 0;
14. }
Main Memory
Memory Address
102543
142586
135545
135487

It is the main function where the program execution begins
2. int main()
3. {
4. int a, b, c;
5.
7. scanf("%d%d",&a,&b);
8.
9. c = a + b;
10.
12.
13. return 0;
14. }
Main Memory
Memory Address
102543
142586
135545
135487

First open brace of main function
2. int main()
3. {
4. int a, b, c;
5.
7. scanf("%d%d",&a,&b);
8.
9. c = a + b;
10.
12.
13. return 0;
14. }
Main Memory
Memory Address
102543
142586
135545
135487

Memory allocation for three variable a,b,c
2. int main()
3. {
4. int a, b, c;
5.
7. scanf("%d%d",&a,&b);
8.
9. c = a + b;
10.
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
2. int main()
3. {
4. int a, b, c;
5.
7. scanf("%d%d",&a,&b);
8.
9. c = a + b;
10.
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
2. int main()
3. {
4. int a, b, c;
5.
7. scanf("%d%d",&a,&b);
8.
9. c = a + b;
10.
12.
13. return 0;
14. }
Memory
int a
int c
Main Memory
int b
Address
102543
142586
135545
135487

give the value of a=6 and b=5
6
5

Insertion of a and b in memory
2. int main()
3. {
4. int a, b, c;
5.
7. scanf("%d%d",&a,&b);
8.
9. c = a + b;
10.
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
2. int main()
3. {
4. int a, b, c;
5.
7. scanf("%d%d",&a,&b);
8.
9. c = a + b;
10.
12.
13. return 0;
14. }
Memory
6
int c
Main Memory
5
Address
102543
142586
135545
135487

Arithmatic addition operation
2. int main()
3. {
4. int a, b, c;
5.
7. scanf("%d%d",&a,&b);
8.
9. c = a + b;
10.
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
2. int main()
3. {
4. int a, b, c;
5.
7. scanf("%d%d",&a,&b);
8.
9. c = a + b;
10.
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.
2. int main()
3. {
4. int a, b, c;
5.
7. scanf("%d%d",&a,&b);
8.
9. c = a + b;
10.
12.
13. return 0;
14. }
Memory
Main Memory
Address
102543
142586
135545
135487
6
11
5

give the value of c = 11 (answer)
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.
2. int main()
3. {
4. int a, b, c;
5.
7. scanf("%d%d",&a,&b);
8.
9. c = a + b;
10.
12.
13. return 0;
14. }
Memory
Main Memory
Address
102543
142586
135545
135487
6
11
5

last close brace of main function
2. int main()
3. {
4. int a, b, c;
5.
7. scanf("%d%d",&a,&b);
8.
9. c = a + b;
10.
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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How c program execute in c program