1 A Simple C Program /* Take a number multiply it by 10 and display it */ #include main() { int number, result; printf("Type in a number \n"); scanf("%d", &number); result = number *10; printf("The number multiplied by 10 equals %d\n", result); } Sample Program Output Type in a number 23 The number multiplied by 10 equals 230

2 A Simple C Program /* Take a number multiply it by 10 and display it */ #include main() { int number, result; printf("Type in a number \n"); scanf("%d", &number); result = number *10; printf("The number multiplied by 10 equals %d\n", result); } Sample Program Output Type in a number 23 The number multiplied by 10 equals 230 Comments are set between /* and */

3 A Simple C Program /* Take a number multiply it by 10 and display it */ #include main() { int number, result; printf("Type in a number \n"); scanf("%d", &number); result = number *10; printf("The number multiplied by 10 equals %d\n", result); } Sample Program Output Type in a number 23 The number multiplied by 10 equals 230 The C pre-processor replaces this directive with the contents of the stdio.h header file from the standard C library.

4 A Simple C Program /* Take a number multiply it by 10 and display it */ #include main() { int number, result; printf("Type in a number \n"); scanf("%d", &number); result = number *10; printf("The number multiplied by 10 equals %d\n", result); } Sample Program Output Type in a number 23 The number multiplied by 10 equals 230 Every C program must have one main function.

5 A Simple C Program /* Take a number multiply it by 10 and display it */ #include main() { int number, result; printf("Type in a number \n"); scanf("%d", &number); result = number *10; printf("The number multiplied by 10 equals %d\n", result); } Sample Program Output Type in a number 23 The number multiplied by 10 equals 230 Each variable must be explicitly defined as a specific type.

6 A Simple C Program /* Take a number multiply it by 10 and display it */ #include main() { int number, result; printf("Type in a number \n"); scanf("%d", &number); result = number *10; printf("The number multiplied by 10 equals %d\n", result); } Sample Program Output Type in a number 23 The number multiplied by 10 equals 230 The stdio library defines the printf() function for creating output.

7 A Simple C Program /* Take a number multiply it by 10 and display it */ #include main() { int number, result; printf("Type in a number \n"); scanf("%d", &number); result = number *10; printf("The number multiplied by 10 equals %d\n", result); } Sample Program Output Type in a number 23 The number multiplied by 10 equals 230 The stdio library defines the printf() function for creating output. \n is the newline character

8 A Simple C Program /* Take a number multiply it by 10 and display it */ #include main() { int number, result; printf("Type in a number \n"); scanf("%d", &number); result = number *10; printf("The number multiplied by 10 equals %d\n", result); } Sample Program Output Type in a number 23 The number multiplied by 10 equals 230 The stdio library defines the scanf() function for capturing input.

9 A Simple C Program /* Take a number multiply it by 10 and display it */ #include main() { int number, result; printf("Type in a number \n"); scanf("%d", &number); result = number *10; printf("The number multiplied by 10 equals %d\n", result); } Sample Program Output Type in a number 23 The number multiplied by 10 equals 230 %d tells scanf() to interpret the input as a decimal value

10 A Simple C Program /* Take a number multiply it by 10 and display it */ #include main() { int number, result; printf("Type in a number \n"); scanf("%d", &number); result = number *10; printf("The number multiplied by 10 equals %d\n", result); } Sample Program Output Type in a number 23 The number multiplied by 10 equals 230 The = operator is used for assignment. The * operator is used for multiplication.

11 A Simple C Program /* Take a number multiply it by 10 and display it */ #include main() { int number, result; printf("Type in a number \n"); scanf("%d", &number); result = number *10; printf("The number multiplied by 10 equals %d\n", result); } Sample Program Output Type in a number 23 The number multiplied by 10 equals 230 %d tells printf() to treat the value of the result variable as a decimal nbr.