A cheat sheet, everything I know about c

• The main program:

   /*****************************************************************/
   /*  Programmer:  Dan Bennett                                     */
   /*  Program: Homework 2, area under the curve                    */
   /*  This program finds the area under the curve of a fourth      */
   /*  degree polynomial.                                           */
   /*****************************************************************/
  
   #include <iostream>
   // other includes
  
   int ACONSTENT=4;
  
   float fofx(float x, float a, float b, float c ); 
   // other function prototypes
  
   main () {
      int avaraible;
  
      code
   }
  
   float fofx(float x, float a, float b, float c) {
      float ret;
  
      ret = a*x*x+b*x+c;
      return(ret);
  
      code
   }
  

• The main routine

      main () {
      }
  

• types
  • int
  • bool
  • float, double
  • char
• Operators
  • +,-,/,*,%
  • ==, <= != ...
  • ++, +=, -= ...
• strings
  • #include <string>
  • +
  • .length
  • .size
  • string::size_type lengthvar
  • lenghtvar = astring.length()
  • pos = astring.find(string)
  • newstring = astring.substr(starpos,endpos)
• input/output
  • cin
  • cout
  • endl, '/n'
  • <iostream>
  • <iomanip>
  • setw(n)
  • setprecision(n)
  • cin.get(char)
  • cin.ignore(count,char)
  • getine(cin,string)
• if

     if (condition) {
         statements
     } else {
         statements
     }
  

• for

      for(init_statement; condition; increment statement) {
          statements;
      }
  

• While

      while ( condition) {
          statements
      }
  

• do

      do {
         statements
      } while (condition)
  

• Case statement

      switch (var) {
         case val1: 
                    statements; 
                    break
         case val2:
         case val3:
                    statements;
  		  break;
  	default:
  	          statements;
      }
  

• Functions

       type funname ( [const] vartype [&] varname, ...) {
           statements;
       }