/*lx2_1.c输入两个整形数想，x,y之和、差、积、、x/y的商和余数*/ #include void main() {

int x,y;

printf(\scanf(\printf(\printf(\printf(\printf(\printf(\

}

/*lx2_2.c按下列要求编写程序，对变量a,b,c进行unsigned int型说明，将65赋给a,66赋给b,67赋给c，对变量a,b,c用%c格式输出显示*/ #include \main()

{ unsigned int a,b,c; a=65; b=66; c=67;

printf(\

}

/*lx2_3.c输入三角形三条边长，求三角形面积*/ #include #include main( )

{ int a,b,c; double area,s;

printf(\ scanf(\ s=(double)(a+b+c)/2; area=sqrt(s*(s-a)*(s-b)*(s-c)); printf(\}

/*lx2_4.c已知半径r=3.4cm，求圆的周长和面积（保留2位小数）*/ #include void main() { float r,l,s; r=3.4; l=2*r*3.14; s=r*r*3.14;

printf(\园周长＝%.2f\\n\printf(\园面积＝%.2f\\n\

}

/*lx2_5.c编写b取35.425,c取52.954，将b+c变为整数赋给a1，对b、c取整后求其和的程序*/ #include main( ) {

int a1,a2; float b,c; b=35.425; c=52.954; a1=(int)(b+c); a2=(int)b+(int)c; printf(\ printf(\}

/*lx2_6.c编写a为100，b为50，若a>b成立将a赋予c，否则将b赋予c。同时，若a main( ) {

int a=100,b=50,c,d;

c=((a>b)?a:b); d=((a

/*lx2_7.c输入3个字符型数据，将其转换成相应的整数后，求它们的平均值并输出*/ #include void main() { char a,b,c; }

/*lx2_8.c设a的值为12，b的值为18，c的值为12，求a&&b，a||b，a&&c计算结果的值*/ #include main( ) {

int a=12,b=18,c=12; float x;

printf(\scanf(\x=(a+b+c)/3.0;

printf(\