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2.2

#include

main()

{

float x=2.5,y=2.5,z=2.5;

printf("x=%f\n",x);

printf("y=%f\n",y);

printf("z=%f\n",z);

}

3.1(1)

#include

main()

{

int a=12,b=3;

float x=18.5,y=4.6;

printf("%f\n",(float)(a*b)/2);

printf("%d\n",(int)x%(int)y);

}

3.1(2)

#include

main()

{

int x=32,y=81,p,q;

p=x++;

q=--y;

printf("%d %d\n",p,q);

printf("%d %d\n",x,y);

}

3.2

#include

main()

{

int x,b0,b1,b2,s;

printf("Inputx:");

scanf("%d",&x);

b2=x/100;

b1=(x-b2*100)/10;//或(x%100)/10;或x/10%10;

b0=x%10;

s=b0*100+b1*10+b2;

printf("s=%d\n",s);

}

3.3

#include

#include

main()

{

float rate=0.0225;

float n,capital,deposit;

printf("Input n,capital:");

scanf("%f,%f",&n,&capital);

deposit=capital*pow(1+rate,n);

printf("deposit=%f\n",deposit);

}

3.4

#include

#include

main()

{

float a, b, c;

double x, y;

printf("Input a, b, c:");

scanf("%f %f %f", &a, &b, &c);

x=(-b+sqrt(b*b-4*a*c))/(2*a);

y=(-b-sqrt(b*b-4*a*c))/(2*a);

printf("x=%f,y=%f\n",x,y);

}

习题4

4.1(1)

#include

main()

{

char c1='a',c2='b',c3='c';

printf("a%cb%cc%c\n",c1,c2,c3);

}

4.1(2)

#include

main()

{

int a=12,b=15;

printf("a=%d%%,b=%d%%\n",a,b);

}

4.1(3)

#include

main()

{

int a,b;

scanf("%2d%*2s%2d",&a,&b);

printf("%d,%d\n",a,b);

}

4.2

#include

main()

{

long a,b;

float x,y;

scanf("%d,%d\n",&a,&b);

scanf("%f,%f\n",&x,&y);

printf("a=%d,b=%d\n",a,b);

printf("x=%f,b=%f\n",x,y);

}

5.1

#include

main()

{

float a;

printf("Input a:");

scanf("%f",&a);

if(a>=0)

{

a=a;

printf("a=%f\n",a);

}

else

{

a=-a;

printf("a=%f\n",a);

}

}

5.2

#include

main()

{

int a;

printf("Input a:");

scanf("%d", &a);

if(a%2==0)

{

printf("a 是偶数");

}

else

{

printf("a 是奇数");

}

}

5.3

#include

#include

main()

{

float a,b,c,s,area;

printf("Input a, b, c:");

scanf("%f %f %f", &a, &b, &c);

if(a+b>c&&a+c>b&&b+c>a)

{