C 練習（一）

#include <stdio.h>int main(){    float sum = 0.0,avg = 0.0;    int Good ,normal,fine,bad,num ,count;    count = num = Good = normal = fine = bad = 0;    scanf("%d",&num);    while(num>0 && num<101){        sum += num;        count += 1;        if(num >= 90){           Good +=1;        }else if(num>=80 && num<90){           normal += 1;        }else if(num >=70 && num <80){           fine +=1;        }else{           bad +=1;        }        scanf("%d",&num);    }    avg = sum/count;    printf("平均成績是%f\n",avg);    printf("總分是%f\n",sum);}

雞兔 同籠子問題

#include <stdio.h>void main(){      int h,f,m,n;      printf("請輸入總個數");      scanf("%d",&h);      printf("請輸入腳的數量");      scanf("%d",&f);      m=(4*h-f)/2;      n=(f-2*h)/2;      printf("共有%d只雞,%d只兔子",m,n);}

 倒敘數組

 

#include <stdio.h>#define LONGTH 5 void main(){     int j,temp,array[] = {1,2,3,4,5};    for(j=0;j<LONGTH/2;j++){        temp = array[j];        array[j] = array[LONGTH-j-1];        array[LONGTH-j-1] = temp;    }    for(j=0;j<LONGTH;j++){       printf("%d",array[j]);    }}