1 / 9

A simple C program: Printing a line of text

A simple C program: Printing a line of text. #include &lt;stdio.h&gt; main() { printf(“hello, world<br>”); } Program output: hello, world. More C programs. #include &lt;stdio.h&gt; main() { printf(“My first program.<br>”); printf(“It is wonderful.”); } Program output: My first program.

zoltin
Download Presentation

A simple C program: Printing a line of text

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A simple C program: Printing a line of text #include <stdio.h> main() { printf(“hello, world\n”); } Program output: hello, world

  2. More C programs #include <stdio.h> main() { printf(“My first program.\n”); printf(“It is wonderful.”); } Program output: My first program. It is wonderful.

  3. More C programs #include <stdio.h> main() { printf(“My first program.”); printf(“It is wonderful.”); } Program output: My first program.It is wonderful.

  4. Printing characters Source program: printf(“Welcome\nto\nCOMP 1180!\n”); Program output: Welcome to COMP 1180! You can use printf to print a string of characters; but there are special cases: • For double quote, use \” • For single quote, use \’ • For backslash, use \\ • For newline, use \n

  5. Formatted Output (integer,float,char,string) • Almost every C program start with the following: #include <stdio.h> for the access to the standard input/output library • For the “printf” statement: printf(format-string, arg1, arg2, ...); • Format-string tells the program how to print the arguments out • Format-string contains two types of objects: ordinary characters and conversion specifications • Each conversion specification begins with a % and ends with a conversion character and maybe have a minus sign, a number, and a period in between

  6. Basic Printf Conversions %d %i integer %o octal (Base 8) %x %X hexadecimal (Base 16) %f floating point %e %E floating point (exponent) %g %G floating point (general format) %c single character %s character string %% print a %

  7. Examples on Formatted Printf Statements int a = 5; int b = 10; 123456789012345 printf(“%d\n”, a); 5 printf(“%5d\n”, a); 5 printf(“%5d\n”, b); 10 printf(“%d %d\n”, a, b); 5 10 printf(“a = %d b = %3d\n”, a, b); a = 5 b = 10 float x = 33.3456789; 123456789012345 printf(“%f\n”, x); 33.345679 printf(“%e\n”, x); 3.33457e+01 printf(“%8.3f\n”, x); 33.346 x = 0.3334567; printf(“%e\n”, x); 3.33457e-01

  8. More Examples on Printf (strings) printf(“%s”, “hello, world”); hello, world: printf(“%10s”, “hello, world”); hello, world: printf(“%.10s”, “hello, world”); hello, wor: printf(“%-10s”, “hello, world”); hello, world: printf(“%.15s”, “hello, world”); hello, world: printf(“%-15s”, “hello, world”); hello, world : printf(“%15.10s”, “hello, world”); hello, wor: printf(“%-15.10s”, “hello, world”); hello, wor :

  9. Formatted Input • For “scanf” statements, scanf(format-string, addr1, addr2, ...); • Examples: float f; int lower, upper; char ch; scanf(“%f”, &fahr); scanf(“%d%d”, &lower, &upper); scanf(“%c”, ch); ch = getchar(); get the next character from STDIN putchar(ch); put the character to STDOUT

More Related