执行以下JavaScript代码,最后变量j的值应该是( )。 <script type="text/javascript">var j=0;for(var i=0;i<9;i++){j++;if(i==6){break;}}alert(j);</script>
A: 5
B: 6
C: 7
D: 0
A: 5
B: 6
C: 7
D: 0
举一反三
- 执行以下JavaScript代码,最后变量j的值应该是()。varj=0;for(vari=0;i<9;i++){j++;if(i==6){break;}}alert(j); A: 5 B: 6 C: 7 D: 0
- 下面代码,k的运行结果是() var i = 0,j = 0; for(;i<10,j<6;i++,j++){ k = i + j; }
- 中国大学MOOC: 下面代码,k的运行结果是() var i = 0,j = 0; for(;i<10,j<6;i++,j++){ k = i + j; }
- 已知类myCircle中包含成员函数void display(),在定义了myCircle [][]d; d = new myCircle[10][8];并完成d的初始化的前提下,下面语句不正确的是: A: for (int i = 0; i < 10; i++) { for (int j = 0; j < 8; j++) { d[i][j].display(); } } B: for (int i = 0; i <= 10; i++) { for (int j = 0; j < =8; j++) { d[i][j].display(); } } C: for (int i = 9; i <=0; i--) { for (int j = 7; j < =0; j--) { d[i][j].display(); } } D: for (int i = 9; i <=0; i--) { d[i][2].display(); }
- 针对如下三个实现矩阵求和的不同函数:int a[N][N];int sumA( int a[N][N] ){ int i, j; int sum = 0; for ( i = 0; i < N; i++ ) for ( j = 0; j < N; j++ ) sum += a[i][j]; return sum;}int sumB( int a[N][N] ){ int i, j; int sum = 0; for ( j = 0; j < N; j++ ) for ( i = 0; i < N; i++ ) sum += a[i][j]; return sum;}int sumC( int a[N][N] ){ int i, j; int sum = 0; for ( j = 0; j < N; j+=2 ) for ( i = 0; i < N; i+=2 ) sum += ( a[i][j] + a[i+1][j] + a[i][j+1] + a[i+1][j+1] ); return sum;}当N足够大的时候,三个函数的运行时间t1、t2、t3符合下列哪种情况?()[/i][/i][/i][/i] A: t1 > t2 > t3 B: t3 > t1 > t2 C: t2 > t3 > t1 D: t3 > t2 > t1