如何在c

时间:2018-05-09 10:52:11

标签: c struct structure

我试图致电rrandom选择一个随机ID和名称并将其放入buff struct,然后第二次调用rrandom来选择新的随机值并将其放入也在buff struct作为第二项。

如何在不删除第一项的情况下将第二个值分配给buff struct?

#include <stdio.h>    
#include <stdlib.h>   
#include <string.h>  
#define size 4

typedef struct Org                  
{
   int  id[4]; 
   char name[4][7];  
}org;

void rrandom(org select[size], ???){
int i,j,r=0;
for (i=0; i<1;i++){
   r = (rand() % (4 - 0)) + 0;
  for( j=0;j<4;j++){ 
    buf[i].id[j]= select[r].id[j] ;
    strcpy(buf[i].name[j], select[r].name[j]);

  }}
for ( int i=0; i<2 ;i++){

   for(int j=0;j<4;j++){ 
   printf("bname %s  bid = %d \n", buf[i].name[j], buf[i].id[j]);

 }}
}
void main(  )
{
int i,j;

org select[size]; 
org buf[2];

sprintf(select[0].name[0],"1ello1");
sprintf(select[0].name[1],"1ello2");
sprintf(select[0].name[2],"1ello3");
sprintf(select[0].name[3],"1ello4");
sprintf(select[1].name[0],"2ello1");
sprintf(select[1].name[1],"2ello2");
sprintf(select[1].name[2],"2ello3");
sprintf(select[1].name[3],"2ello4");
sprintf(select[2].name[0],"3ello1");
sprintf(select[2].name[1],"3ello2");
sprintf(select[2].name[2],"3ello3");
sprintf(select[2].name[3],"3ello4");
sprintf(select[3].name[0],"4ello1");
sprintf(select[3].name[1],"4ello2");
sprintf(select[3].name[2],"4ello3");
sprintf(select[3].name[3],"4ello4");
sprintf(select[4].name[0],"5ello1");
sprintf(select[4].name[1],"5ello2");
sprintf(select[4].name[2],"5ello3");
sprintf(select[4].name[3],"5ello4");
printf(" Initial id :\n");
for(i=0;i<4 ;i++)                         
{
    for(j=0;j< 4;j++)                       
    { 
         select[i].id[j]= j;        
}    }
rrandom(select,???);
rrandom(select,???);
for ( int i=0; i<2 ;i++){   
   for(int j=0;j<4;j++){ 
   printf("from main bname %s  bid = %d ", buf[i].name[j], 
    buf[i].id[j]);}
    printf("\n\n");
 } 
}

1 个答案:

答案 0 :(得分:1)

您应该在rrandom中传递结果结构的地址:

void rrandom(org select[size], struct buff &bf){
  int j,r=0;
  r = (rand() % (4 - 0)) + 0;
  for( j=0;j<4;j++){ 
    bf->bid[j]= select[r].id[j] ;
    strcpy(bf->bname[j], select[r].name[j]);
  }
  for(int j=0;j<4;j++){ 
    printf("bname %s  bid = %d \n", bf->bname[j], bf->bid[j]);
  }
}

然后,您可以使用以下内容替换rresult来电,将其用于主屏幕。

rrandom(select, buf);
rrandom(select, buf + 1);