翁凯C语言--------第五周编程练习-------念整数和素数和

第五周编程练习-------念整数和素数和

#include<stdio.h>
int main(){
int count=0,sum=0;
 int isPrime;
 int m,n,i,j;
 scanf("%d %d",&n,&m);
 if(n>=0&&m<=200&&n<=m){
  for(i=2;;i++){
   isPrime=1;
   for(j=2;j<i;j++)
    if(i%j==0) {
    isPrime=0;
        break;
     }
   if(isPrime==1) count++;
   if(count>=n&&count<=m&&isPrime==1)
    sum+=i;
   if(count==m) break;
  }
   printf("%d",sum);
 }
 return 0;
}

#include<stdio.h>
#include<math.h>
int main(){
int number,n,digit=0,x;
 scanf("%d",&number);
 n=number;
 if(n>=-100000&&n<=100000){
 if(n<0) {
   printf("fu ");
   number=n=-n;}
  if(n==0) printf("ling"); //对特殊0做处理
  while(number>0){
   number/=10;
   digit++;
  }
  x=pow(10,digit-1);
  int i,shu;
  for(i=0;i<digit;i++){
  shu=n/x%10;
  x=x/10;
  switch(shu){
  case 0:
   printf("ling"); break;
  case 1:
   printf("yi"); break;
  case 2:
   printf("er"); break;
  case 3:
   printf("san"); break;
  case 4:
   printf("si"); break;
  case 5:
   printf("wu"); break;
  case 6:
   printf("liu"); break;
  case 7:
   printf("qi"); break;
  case 8:
   printf("ba"); break;
  case 9:
   printf("jiu"); break;
  }
  if(i!=digit-1) printf(" ");
}
}
return 0;
}

方法二：不使用switch,用数组存储

#include<stdio.h>
#include<math.h>
int main(){
 int number,n,digit=0,x;
 char shubiao[10][5]={"ling","yi","er","san","si","wu","liu","qi","ba","jiu"}; //5是因为加一个串结束符，这样才可以存储
 scanf("%d",&number);
 n=number;
 if(n>=-100000&&n<=100000){
  if(n<0) {
   printf("fu ");
   number=n=-n;}
    if(n==0) printf("ling"); //对特殊0做处理
  while(number>0){
   number/=10;
   digit++;
  }
  x=pow(10,digit-1);
  int i,shu;
  for(i=0;i<digit;i++){
  shu=n/x%10;
  x=x/10;
   printf("%s",shubiao[shu]);
  if(i!=digit-1) printf(" ");
  }
  }
  return 0;

  }