有以下程序 #include <stdio.h> main() { FILE *fp; int a[10]={1,2,3,0,0},i; fp=topen("d2.dat","wb"); fwrite(a,sizeof(int),5,fp); fwrite(a,sizeof(int),5,fp); fclose(fp); fp=fopen("d2.dat","rb"); fread(a,sizeof(int),10,fp); fclose(fp); for(i=0;i<10;i++) printf("%d,",a[i]); } 程序的运行结果是______。
A. 1,2,3,0,0,1,2,3,0,0,
B. 1,2,3,1,2,3,0,0,0,0,
C. 123,0,0,0,0,123,0,0,0,0,
D. 1,2,3,0,0,0,0,0,0,0,
若各选项中所用变量已正确定义,函数fun中通过return语句返回一个函数值,以下选项中错误的程序是______。
A. main(){ ……x=fun(2,10);……}float fun(int a,int b){……}
B. float fun(int a,int b){……}main(){ ……x=fun(i,j);……}
C. float fun(int,int);main(){……x=fun(2,10);……}float fun(int a,int b){……}
D. main(){ float fun(int i,int j);……x=fun(i,j);……}float fun(int a,int b){……}