while语句形式: while(条件)语句; [例] void main() int i=1;sum=0; while (i<=10) {sum=sum+i; i++; cout<<“sum=”<<sum<<endl; 运行结果:sum=55 while 语句形式: while(条件)语句; [例] void main( ) { int i=1; sum=0; while (i<=10) {sum=sum+i; i++; } cout<<“sum=”<<sum<<endl; } 运行结果:sum=55