long s; if( (n==1)||(n==2)) s=2; else s=n+fun(n-1); return(s); } main( ) {long x; x=fun(4);接上题printf("%ld\n",x)
来源：学生作业帮助网 编辑：六六作业网 时间：2024/05/12 06:22:55
longs;if((n==1)||(n==2))s=2;elses=n+fun(n-1);return(s);}main(){longx;x=fun(4);接上题printf("%ld\n",x)lo
long s; if( (n==1)||(n==2)) s=2; else s=n+fun(n-1); return(s); } main( ) {long x; x=fun(4);接上题printf("%ld\n",x)
long s; if( (n==1)||(n==2)) s=2; else s=n+fun(n-1); return(s); } main( ) {long x; x=fun(4);
接上题printf("%ld\n",x)
long s; if( (n==1)||(n==2)) s=2; else s=n+fun(n-1); return(s); } main( ) {long x; x=fun(4);接上题printf("%ld\n",x)
fun(4)=4+fun(3)
=4+3+fun(2)
=7+fun(2)
=7+2
=9