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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

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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 */

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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.

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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.

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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.

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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.

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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

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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.

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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

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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.

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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.

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Ping Zhang 10/08/2010. You can get data from the user (input) and display information to the user (output). However, you must include the library.

Ping Zhang 10/08/2010. You can get data from the user (input) and display information to the user (output). However, you must include the library.

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