1)讀檔案的內容(例如)：
12
34
56
輸出到：
56
34
12
(逆序)
第一題,注意可增長數組的應用.
#include
#include
int main(void)
{
int MAX = 10;
int *a = (int *)malloc(MAX * sizeof(int));
int *b;
FILE *fp1;
FILE *fp2;
fp1 = fopen(“”,”r”);
if(fp1 == NULL)
{printf(“error1″);
exit(-1);
}
fp2 = fopen(“”,”w”);
if(fp2 == NULL)
{printf(“error2″);
exit(-1);
}
int i = 0;
int j = 0;
while(fscanf(fp1,”%d”,&a[i]) != EOF)
{
i++;
j++;
if(i >= MAX)
{
MAX = 2 * MAX;
b = (int*)realloc(a,MAX * sizeof(int));
if(b == NULL)
{
printf(“error3″);
exit(-1);
}
a = b;
}
}
for(;–j >= 0;)
fprintf(fp2,”%dn”,a[j]);
fclose(fp1);
fclose(fp2);
return 0;
}
可謂是反序的經典例程.
void inverse(char *p)
{
if( *p = = ‘