/*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<stdio.h>voidmain(){intx,y;printf("Pleaseenterx,y:");scanf("%d%d",&x,&y);printf("\nx+y=%d\n",x+y);printf("x-y=%d\n",x-y);printf("x*y=%d\n",x*y);printf("x/y=%d\n",x/y);printf("x%%y=%d\n",x%y);}/*lx2_2.c按下列要求编写程序，对变量a,b,c进行unsignedint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"stdio.h"main(){unsignedinta,b,c;a=65;b=66;c=67;printf("a=%c,b=%c,c=%c",a,b,c);}/*lx2_3.c输入三角形三条边长，求三角形面积*/#include<stdio.h>#include<math.h>main(){inta,b,c;doublearea,s;printf("Pleaseentera,b,c:");scanf("%d,%d,%d",&a,&b,&c);s=(double)(a+b+c)/2;area=sqrt(s*(s-a)*(s-b)*(s-c));printf("area=%.2lf",area);}/*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<stdio.h>voidmain(){floatr,l,s;r=3.4;l=2*r*3.14;s=r*r*3.14;printf("园周长＝%.2f\n",l);printf("园面积＝%.2f\n",s);}/*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<stdio.h>main(){inta1,a2;floatb,c;b=35.425;c=52.954;a1=(int)(b+c);a2=(int)b+(int)c;printf("%d\n",a1);printf("%d\n",a2);}/*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<b成立将a赋予d，否则将b2赋予d的程序*/#include<stdio.h>main(){inta=100,b=50,c,d;c=((a>b)?a:b);d=((a<b)?a:b*b);printf("%d\n",c);printf("%d\n",d);}/*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<stdio.h>voidmain(){chara,b,c;floatx;printf("Pleaseenter:\n");scanf("%c%c%c",&a,&b,&c);x=(a+b+c)/3.0;printf("(a+b+c)/3=%.2f\n",x);}/*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<stdio.h>main(){inta=12,b=18,c=12;intd,e,f;d=a&&b;e=a||b;f=a&&c;printf("%d&&%d=%d\n",a,b,d);printf("%d||%d=%d\n",a,b,e);printf("%d&&%d=%d\n",a,c,f);}/*lx2_9.c火车做直线匀加速运动，初速度为0，加速度为0.19m/s2，求30s时火车的速度（速度以km/h时为单位）*/#include<stdio.h>voidmain(){floata,v1,v30;intt=30;a=0.19;v1=0;v30=a*t*3600/1000;printf("v30=%.2f\n",v30);}/*lx2_10.c一辆汽车以15m/s的速度先开出10min后另一辆汽车以20m/s的速度追赶，问多少分钟可以追上？*/#include<stdio.h>voidmain(){floatv1=15,t1=10*60,v2=20,t2;t2=(v1*t1)/(v2*60);printf("%.2f分钟可以追