function

#include <stdio.h>
int area(int x,int y)
{
int s;
s=x*y;
return s;
}
int main()
{
  int x,y;
  int sum;
  x=9;y=9;
  sum = area(x,y);
  printf("sum=%d\n",sum);
  return 0;
}

switch case

#include <stdio.h>
int main()
{
int score;
int value;
scanf("%d",&score);
value = score/10;
switch(value)
{
case 10:
printf("grade='A'\n");
break;
case 9:
printf("grade='A'\n");
break;
    case 8:
printf("grade='B'\n");
break;
    case 7:
printf("grade='C'\n");
break;
    case 6:
printf("grade='D'\n");
break;
    default:
printf("grade='E'\n");
break;

}

}

for

#include <stdio.h>
int main()
{
  int cnt;
  int sum=0;
  for(cnt=1;cnt<=10;cnt++)
  {
  sum = sum + cnt;
  }
  printf("%d\n",sum);
}

if else

#include <stdio.h>
int main()
{
  int num1,num2;
  char op;
  float ans;
  scanf("%d %c %d", &num1 ,&op ,&num2);
  if(op == '+')
  {
  ans = num1 + num2;
  }
  else if(op == '-')
  {
  ans = num1 - num2;
  }
  else if(op == '*')
  {
  ans = num1 * num2;
  }
  else if(op == '/')
  {
  ans = (float)num1 / num2;
  }
  printf("ans: %f\n",ans);
return 0;
}

---------------------------------------------------------------------------------------------------------------------

#include <stdio.h>
int main()
{
int score;
char grade;
scanf("%d",&score);
if(score>=90 && score<=100)
{
printf("grade = A\n");
}
else if(score>=80 && score<90)
{
printf("grade = B\n");
}
else if(score>=70 && score<80)
{
printf("grade = C\n");
}
else if(score>=60 && score<70)
{
printf("grade = D\n");
}
else
{
printf("grade = E\n");
}
}

while猜錯繼續做(成立)，不成立才結束

#include <stdio.h>
int main()
{
int ans = 4;
int guess;
printf("Please enter your guess:");
scanf("%d",&guess);
while(guess != ans)
{
if(guess>ans)
{
printf("Too large!\n");
}
else
{
printf("Too small!\n");
}
printf("Please enter your guess:");
scanf("%d",&guess);
}
printf("Correct!\n");
return 0;
}

---------------------------------------------------------------------

#include <stdio.h>
int main()
{
int ans = 4;
int guess;
do
{
printf("Please enter your guess:");
         scanf("%d",&guess);
if(guess>ans)
{
printf("Too large!\n");
}
else if(guess<ans)
{
printf("Too small!\n");
}
else
{
printf("Correct!\n");
}
}
while(guess != ans) ;//猜錯繼續做(成立)，不成立才結束
return 0;
}

beep 3 times

#include <at89x52.h>
sbit bz = P3^1;
void delay_500us(int k)
{
 int i,j;
 for(i=0;i<k;i++)
  for(j=0;j<60;j++)
        ;
}
void pulse_bz()
{
 int i;
 for(i=0;i<100;i++)//T=1ms run 100 times
 {
  bz=0;delay_500us(1);
  bz=1;delay_500us(1);
 }
}
main()
{
 pulse_bz(); delay_500us(500);
 pulse_bz(); delay_500us(500);
 pulse_bz(); delay_500us(500);
 while(1);
}

https://www.beauty321.com/post/16494

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