全国计算机等级考试二级C语言复习资料Part2.doc

全国计算机等级考试二级C语言考前辅导 选择结构程序设计 Page 3(1) 2011.3.7运行时输入12，则输出结果为 int x; scanf(%d, &x); if (x 15) printf(%d, x - 5); if (x 10) printf(%d, x); if (x 5) printf(%d, x + 5);(2) 2011.3.10以下程序的运行结果是 int x = 10, y = 20, t = 0; if (x = y) t = x; x = y; y = t; printf(%d %d, x, y);(3) 2008.9.20以下程序的运行结果是 int a = 10, b = 50, c = 30; if (a b) a = b, b = c; c = a; printf(%d%d%d, a, b, c);(4) 2009.9.17以下执行效果与其它三个不同的是 A)if (a b) c = a, a = b, b = c; B)if (a b) c = a; a = b; b = c; C)if (a b) c = a, a = b, b = c; D)if (a b) c = a; a = b; b = c; (5) 2005.4.8以下程序的运行结果是 int a = 3, b = 4, c = 5, t = 99; if (b a & a c) t = a; a = c; c = t; if (a c & b c) t = b; b = a; a = t; printf(%d%d%d, a, b, c);(6) 以下程序的运行结果是 int a = 3; if (a- 3) printf(%dn, a); else printf(%dn, -a);(7) 以下程序的运行结果是 int a = 0, b = 2, c = 6; if (c = a != 0) printf(%d, a+ + +c); else printf(%d, b- - -c);(8) 2005.9.7以下程序的运行结果是 int a = 1, b = 2, c = 3; if (c = a) printf(%d, c); else printf(%d, b);(9) 2009.3.18若有定义int x; 则以下程序运行时，x的值在哪个范围才会有输出结果if (x 0); D)if (b=0) m = 1; n = 2;(17) 2004.9.22以下程序的运行结果是 int a = 3, b = 4, c = 5, d = 2; if (a c) printf(%d, d+ + 1); else printf(%d, +d + 1); printf(%dn, d);(18) 2006.9.16与条件表达式(x-y)?(x+):(y+)中的表达式(x-y)等价的是 A)(x-y0)B)(x-y0) C)(x-y0)D)(x-y=0)(19) 2007.9.212008.9.17与(E)?(i+):(j-)中E等价的是 A)E=0 B)E!=0C)E=1 D)E!=1(20) 2004.9.232011.9.19下列语句功能与其他语句不同的是 A)if (a) printf(%d, x); else printf(%d, y); B)if (a = 0) printf(%d, y); else printf(%d, x); C)if (a != 0) printf(%d, x); else printf(%d, y); D)if (a = 0) printf(%d, x);else printf(%d, y); (21) 2006.4.19若有int a = 1, b = 3, c = 2; float x = 1.5; 则正确的switch语句是 A)switch (x) C)switch (a+b) case 1.0: b = 0;case 1: b = 0; case 2.0: b = 1;case 2+1: b = 1; B)switch (int)x);Dswitch (a+b) case 1: b = 0;case 1: b = 0; case 2: b = 1;case c: b = 1; (22) 2004.9.9以下程序运行后，a和b的值是 int x = 1, y = 0, a = 0, b = 0; switch (x) case 1: switch (y) case 0: a+; break; case 1: b+; break; case 2: a+; b+; break; (23) 2007.4.9若有：int a=2, b=7, c=5; 则输出 switch (a 0) case 1: switch (b 0) case 1: printf(); break; case 2: printf(!); break; case 0: switch (c=5) case 0: printf(*); break; case 1: printf(#); break; default: printf(&); (24) 2010.3.19有如下嵌套的if语句 if (a b) if (a c) k = a; else k = c; else if (b c) k = b; else k = c; 以下选项中与上述if语句等价的语句是 A)k = (ab) ? a : b; k = (bc) ? b : c; B)k = (ab) ? (bc)?b:c); C)k = (ab) ? (ac)?a:c) : (bc)?b:c); D)k = (ab) ? a : b; k = (a 0 ? 1 : x 0) y = 1; else if (x 0) y = 1;else if (x 0) y = -1; C)if (x 0; D)switch (x 0) case 1: y = 1; case 0: y = x = 0) y = sqrt(x); else y = sqrt(-x); B)y = sqrt(x); if (x = 0) y = sqrt(x); if (x = 0 ? x : -x);- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -(1) 1217(2) 20 0(3) 105010(4)