C Week 1 Simple Calculation program

• Installation of Dev C + +
• Basic Program Framework:

1 # include <stdio.h>23int  main () {4 printf ("Hello world\ n "); \ \" "String, \ nthe newline 5return0; 6 7 }

• Variable:< variable type >< variable name >=< initial value >

2. Can only consist of letters, numbers, underscores, numbers do not appear in the first place.
4. c keyword cannot be used as a variable name
5. Example of change:

   1# include <stdio.h>2 3 intMain () {4     intPrice=0;5     6printf"Please enter the amount (yuan):");7scanf"%d",&Price );8     9     intChange = --Price ;Tenprintf"find you%d dollars", change); One      A     return 0; -}

• Floating-point type double input%LF output%f

  1 intMain () {2     3printf"Please enter the height of feet and inches separately,""as input \ "5 7\" means 5 feet 7 inches:");4     5     Doublefoot;6     Doubleinch;7     8scanf"%LF%LF",& Foot, &inch);9     Tenprintf"height is%f m \ n", ((foot+inch/ A)*0.3048)); One      A     return 0; -}

• Calculate Time Difference

  1 intMain () {2     intHour1, minute1;3     inthour2, Minute2;4     5scanf"%d%d",&hour1,minute1);6scanf"%d%d",&hour2,minute2);7     8     intt1= hour1* -+minute1;9     intT2= hour2* -+Minute2;Ten      One     intt= t2-T1; Aprintf"Time difference is%d hours%d minutes", t/ -, t% -); -}

• HW:

  The program reads a positive three-digit number each time, and then outputs the number in reverse order. Note that when the input number contains the end of 0 o'clock, the output should not have a leading 0. For example, enter 700 and the output should be 7.

  Input format:

  Each test is a 3-bit positive integer.

  Output format:

  The number of output reverse order.

  Input Sample:

  123

  Sample output:

  321

  
  

  1#include <stdio.h>2 voidOutputintN)3 {  4 _bool sign;5     if((n%Ten) ||(sign))6     {7printf"%d", n%Ten);8sign=1;9     }Tenn/Ten? Output (n/Ten) :0; One  A } -  - intMainvoid)  the {  -     intN; -scanf"%d", &n); - output (n); +     return 0;  -}

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C Week 1 Simple Calculation program