1求两个数的和与差输入整数a和b，计算并输出a、b的和与差
#includeintmain(){inta,b,sum,diff;scanf("%d%d",&a,&b);sum=a+b;diff=a-b;printf("Thesumis%d\n",sum);printf("Thedifferenceis%d\n",diff);}2求平方根输入1个实数X，计算井输出其平方根(保留1位小数)
(例:输入17;输出Thesquarerootof17
1)#include#includeintmain(){doublex,root;scanf("%lf",&x);root=sqrt(x);printf("Thesquarerootof%fis%0
1f\n",x,root);}3华氏温度转换为摄氏温度输入华氏温度f，计算并输出相应的摄氏温度c(保留2位小数)
c=5/9(f-32)
(例z括号内是说明输入17
2(华氏温度)输出Thctempratureis-8
22)#includeintmain(){doublef,c;scanf("%lf",&f);c=5
0*(f-32
0);printf("Thetempratureis%0
2f\n",c);}4计算旅途时间输入2个整数time1和time2
表示火车的出发时间和到达时间，计算并输出旅途时间
有效的时间范围是0000到2359，不需要考虑出发时间晚于到达时间的情况
#includeintmain(){inttime1,time2,hours,mins;scanf("%d%d",&time1,&time2);time1=time1/100*60+time1%100;time2=time2/100*60+time2%100;hours=(time2-time1)/60;mins=(time2-time1)%
