谁帮写几行代码，谢

[liumang9527]

怎么将一系列用逗号隔开的数字赋予到一个数组当中。
例如：123.12，123.23，456.12，789.20...一系列数赋予给数组a:array [0..n] of real;

即a[1]=123.12;a[2]=123.23;等等。

这个用C要怎么写？

[linfengc]

123.12，123.23，456.12，789.20...一系列数
是从什么地方来的？

[lunarfan]

直接从键盘读要不就初始化

[liumang9527]

怎么定义动态数组及赋值？

动态数组array是C的概念吗？

[chlaws]

//in.txt
//内容:
//123.12,123.23,456.12,789.20,123.12,123.23,456.12,789.20,
//123.12,123.23,456.12,789.20,123.12,123.23,456.12,789.20,
//123.12,123.23,456.12,789.20,123.12,123.23,456.12,789.20,
//123.12,123.23,456.12,789.20,123.12,123.23,456.12,789.20,
///////////////////////////////////////////////////////////////
//我给你写个从文件读取的

#include<stdio.h>
#include<stdlib.h>
int main()
{
   FILE *fp=NULL;
   int i=0;
   double temp;
   double a[100]={0.0};
   if( (fp=fopen("in.txt","r+"))==NULL)
   {exit(1);}
  
   while(!feof(fp))
   {  
	  temp = 0;
      fscanf(fp,"%lf",&a[i++]);
	  fscanf(fp,"%c",&temp);
   }
   printf("\na[100] is:\n");
   for(i = 0; i<100; i++)
   {
      if(a[i] == 0.0)
         break;
      printf("%lf\t",a[i]);
   }

   fclose(fp);
   system("PAUSE");
   return 0;
}

///////////////////////////////
//结果
/*

a[100] is:
123.120000      123.230000      456.120000      789.200000      123.120000
123.230000      456.120000      789.200000      123.120000      123.230000
456.120000      789.200000      123.120000      123.230000      456.120000
789.200000      123.120000      123.230000      456.120000      789.200000
123.120000      123.230000      456.120000      789.200000      123.120000
123.230000      456.120000      789.200000      123.120000      123.230000
456.120000      789.200000      请按任意键继续. . .
*/

[星羽]

#include <stdlib.h>
#include <stdio.h>

int main() {

    char str[] = "123.12, 123.23, 456.12, 789.20";
    double* pf = 0;
    int num = 1;
    int i = 0;
    char* t = str;
    char* p = str;

    while (t = strchr(t, ',')) {
        ++t;
        ++num;
    }

    pf = (double*)malloc(sizeof(double) * num);

    num = 0;
    t = str;
    while (t = strchr(t, ',')) {
        *t++ = 0;
        pf[num++] = atof(p);
        p = t;
    }
    pf[num++] = atof(p);

    for (; i < num; ++i) {
        printf("%f\n", pf[i]);
    }
        

    free(pf);

    return 0;
}

[fengdream]

int main()
{
 FILE *fp;
 char c,buf[10];
 int n=0, *np,i=0,len;

 fp=fopen("a.txt","r");
 
 while((c=fgetc(pf))!=EOF)
 {
  if(c==',')
   n++;
 } 
 rewind(pf);
 
 len=0;
 np=malloc(n*sizeof(int));
 
 while((c=fgetc(pf))!=EOF)
 {
  if(c==',')
  {
   pf[i++]=atoi(buf);
   len=0;
   continue;
  }
  buf[len++]=c;
 } 
 fclose(pf);
 
 for(i=0;i<n;i++)
  printf("%d\n", pf[i]);
 
 return 0;
}

[fengdream]

一般情况下，所有的数据都可以写到文件里，成亿上百亿的数据都可以，所以上述程序很具有兼容性嘿嘿

[fengdream]

aa

[gezichong]

#include <stdlib.h>
#include <stdio.h>

int main() {

char str[] = "123.12,123.23,456.12,789.20";
double* pf = 0;
int num = 1;
int i = 0;
char* t =str;
char* p = str;

while (t = strchr(t, ',')) {
++t;
++num;
}

pf = (double*)malloc(sizeof(double)*num);

num = 0;


t = strtok(str,",");
while(t != NULL){

pf[num++] = atof(t);
t = strtok(NULL,",");
}

for (; i < num; ++i) {
printf("%.4f\n", pf[i]);
}


free(pf);

return 0;
}