劉俊瑋 - 2014/1/6

2014/1/6 林忠誠老師

#include <stdio.h>

#include <stdlib.h>

main()

{

int unit_price=100;

int Total_price=0,Qty=0;

printf("Input Qty to buy :");

scanf("%d",&Qty);

if (Qty>10){

Total_price=Qty*unit_price*0.9;

printf("You have to pay $%d\n",Total_price);

}

else

{

Total_price=Qty*unit_price;

printf("You have to pay $%d\n",Total_price);

}

system("pause");

}

2014/1/6 林忠誠老師

#include <stdio.h>

#include <stdlib.h>

main()

{

int i;

int a[19]={10,30,50,70,5,2,50,40,60,70,80,90,60,-100,120,16,17,18,19};

for(i=0;i<=19;i++)

if(a[i]==50)

printf( "%d\n",i );

system("PAUSE");

}

2014/1/6 林忠誠老師

#include <stdio.h>

#include <stdlib.h>
main()
{

int add(int, int);
int sub(int, int);
int mul(int, int);
int division(int, int);

int a=100;
int b=20;

int c,operation;

printf(" 1. add operation\n");
printf(" 2. sub operation\n");
printf(" 3. mul operation\n");
printf(" 4. div operation\n");

   printf(" Please input your choice :");
   scanf("%d",&operation);

   printf(" input two number:");
   scanf("%d %d",&a,&b);

switch (operation)
{

case 1: c=add(a,b);
         printf("a+b ===--> %d\n",c);
         break;

case 2: c=sub(a,b);
         printf("a-b ===--> %d\n",c);
         break;

case 3:   c=mul(a,b);
         printf("a*b ===--> %d\n",c);
         break;

case 4: c=division(a,b);
         printf("a/b ===--> %d\n",c);
         break;
}
system("pause");

}

int add(int x, int y)

{
return (x+y);
}

int sub(int x, int y)

{
return (x-y);
}
int mul(int x, int y)

{
return (x*y);
}
int division(int x, int y)

{
return (x/y);
}