C Language Practice

#include <stdio.h>intMainvoid ){        Doublenumber1=0.0; DoubleNumber2=0.0; CharOperation =0; printf ("\nenter the calculation \ n"); scanf ("%lf%c%lf",&number1,operation,&number2); Switch(operation) { Case '+': printf ("=%LF", number1+number2);  Break;  Case'-': printf ("=%LF", number1-number2);  Break;  Case'*': printf ("=%LF", number1*number2);  Break;  Case '/':            if(number2!=0) printf ("=%LF", number1/number2); Elseprintf ("wrong number2");  Break ;  Case '%':            if((Long) number2==0) printf ("Error"); Else ; printf ("=%LF",(Long) number1% (Long) number2);  Break; default: printf ("AIIIIIIIII");  Break; }        return 0;}
The system of the engine room can not be executed, also very silent .... 

#include <stdio.h>intMain () {intI=1; printf ("********************");  for(;i< A; i++) printf ("\n* *"); printf ("\n********************"); return 0;}
Print Small Squares

#include <stdio.h>int  main () {            for (int k=1, j=2; k <=5; ++k,j=j+2)        printf ("\n%-5d", k*j);     return 0 ;} Print several numbers multiplied by

#include <stdio.h>intMain () {Longsum =0l; intCount =0; printf ("\nenter The number of integers you want to summed"); scanf ("%d",&count);   for (int i=1; i<=count;i++) sum+ =  i;    
The above code can be replaced with

for (int i=1;i<=count;sum+=i++); The loop statement is empty, and then the range of the for loop can be found to be the end of the tube to the first semicolon.

The above code can be replaced with

for (int i=count;i>=1;sum+=i--); Inverse operation
    printf ("%ld", sum);     return 0 ;    }
>>6
Back to 6+5+4+3+2+1

an infinite loop only enters N to jump out of # include<stdio.h>#include<ctype.h>//Remember that the ToLower () function must haveintMain () {CharA=0;  for (;;) {printf ("y/n?"); scanf ("%c",&a); if(ToLower (a) = ='N')     Break; }    return 0;}

#include <stdio.h>#include<ctype.h>intMain () {CharA=0; DoubleTotal=0.0; DoubleValue=0.0; intCount =0; printf ("\nthis program ....");  for(;;) {printf ("\nenter a value:"); scanf ("%LF",&value); Total+=value; ++count; printf ("Do you want another value?"); scanf ("%c",&a); if(ToLower (a) = ='Q')         Break; } printf ("%-2LF", total/count); return 0;} The letter and the number, and how did he know it before and after? 

#include <stdio.h>#include<ctype.h>intMain () {intchosen = A; intguess=0; intCount=3;  for(; count>=1; count--) {printf ("\nenter The number you guess"); scanf ("%d",&guess); if(guess==chosen) {printf ("Congratulation"); Gotom;} if((guess> the)|| (guess<1)) printf ("Error"); } printf ("\n\nshibai"); m:printf ("\nyes"); }//goto m; superfluous. Direct can be used with return 0;
Jump out of all direct end, not to break
or | |
and &&
Don't be mistaken.

C Language Practice