第三章 最简单的C语言程序设计-顺序程序设计

3.1

#include<stdio.h>
int main()
{
          
   
float f,c;
f=64.0;
c=(5.0/9)*(f-32);
printf("f=%f
c=%f
",f,c);
return 0;
}

3.2

#include<stdio.h>
int main()
{
          
   float p0=1000,r1=0.0036,r2=0.0225,r3=0.0198,p1,p2,p3;
p1=p0*(1+r1);
p2=p0*(1+r2);
p3=p0*(1+r3/2)*(1+r3/2);
printf("p1=%f
p2=%f
p3=%f
",p1,p2,p3);
return 0;
}

3.3

#include<stdio.h>
int main()
{
          
   
  char c1,c2;
  c1=A;
  c2=c1+32;
  printf("%c
",c2);
  printf("%d
",c2);
  return 0;
 }

3.4

#include<stdio.h>
#include<math.h>
int main()
{
          
   
 double a,b,c,s,area;
 a=3.67;
 b=5.43;
 c=6.21;
 s=(a+b+c)/2;
 area=sqrt(s*(s-a)*(s-b)*(s-c));
 printf("a=%f	b=%f	%f
",a,b,c);
 printf("area=%f
",area);
 return 0;
}

3.5

#include<stdio.h>
#include<math.h>
int main()
{
          
   double a,b,c,disc,x1,x2,p,q;
 scanf("%lf%lf%lf",&a,&b,&c);
 disc=b*b-4*a*c;
 p=-b/(2.0*a);
 q=sqrt(disc)/(2.0*a);
 x1=p+q;x2=p-q;
 printf("x1=%7.2f
x2=%7.2f
",x1,x2);
 return 0;
 }

3.6

#include<stdio.h>
int main()
{
          
   double a=1.0;
printf("%f
",a/3);
return 0;
}

3.7

#include<stdio.h>
int main()
{
          
   float a;
a=10000/3.0;
printf("%f
",a);
return 0;
}

3.8

#include<stdio.h>
int main()
{
          
   
char a=B,b=O,c=Y;
putchar(a);
putchar(b);
putchar(c);
putchar(
);
return 0;
}

3.9

#include<stdio.h>
int main()
{
          
   char a,b,c;
a=getchar();
b=getchar();
c=getchar();
putchar(a);
putchar(b);
putchar(c);
putchar(
);
return 0;
}

3.10

#include<stdio.h>
int main()
{
          
   
char c1,c2;
c1=getchar();
c2=c1+32;
putchar(c2);
putchar(
);
return 0;
}