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C Programming. printf. int printf ( const char * format, ... ); printf ("Characters: %c \n", 'a'); printf ("Decimals: %d %f\n", 1977, 3.14);. Printf - float. %f – floating point. Displays upto 6 decimal places. %0.2f- displays 2 decimal places

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Printf
printf

  • intprintf ( const char * format, ... );

  • printf ("Characters: %c \n", 'a');

  • printf ("Decimals: %d %f\n", 1977, 3.14);


Printf float
Printf - float

  • %f – floating point. Displays upto 6 decimal places.

  • %0.2f- displays 2 decimal places

  • %5.1f- displays 4 digits including one after decimal point. If less digits are there then it gives spaces instead

  • %05.1f- displays 4 digits including one after decimal point. If less digits are there then it gives leading zeros.


Printf decimal
Printf – decimal

  • %5d- displays a the value. If number of digits is less than 5 then leading spaces are given.

  • %-5d- here trailing spaces are given.

  • %05d- here instead of spaces zeros are given.


Scanf
Scanf

  • Reads data from standard input and stores them according to the parameter format into the locations pointed by the additional arguments.

  • Eg: -inti;

    scanf ("%d",&i);


Coding standards
Coding standards

  • Variable

    • Each variable must strictly be named in a meaningful way

    • only one declaration of one variable in one line

    • Eg: -inttotal_marks;

      inttotalmarks;

  • File Name

    • Filenames should be all lowercase and can include underscores (_) or dashes

    • Eg:- helloworld.c or hello_world.c


Coding standards1
Coding standards

  • Comments

    • Meaningful comments and should be proper sentences

    • No spelling mistakes in comments

  • Indenting

    • Two spaces should be used.

  • Line length

    • Max 80 characters per line


Question 1
Question 1

  • Swap two variables using a temporary variable.

  • Input

    • Enter integer value 1- 10

    • Enter integer value 2- 20

  • Output

    • Value 1= 10

    • Value 2= 20

    • After Swapping

    • Value 1= 20

    • Value 2= 10


Question 2
Question 2

  • Compute volume of a cylinder

  • Input

    • Enter the radius of cylinder (float)

    • Enter height of cylinder in float

  • Output

    • Volume of the cylinder(round off to 2 decimal places) =


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