Лабораторная работа: Готовые программы 1 семестра 2012

#include <stdio.h>

#include <math.h>

#include <conio.h> // библиотека, необходимая для работы оператора getch();

void main()

{ float r,v;

int n;

scanf("%d%f",&n,&r);

if(n) v=4./3*3.14*r*r*r;

else v=3.14*r*r;

printf("%f", v);

getch();

}

#include <stdio.h>

#include <math.h>

#include <conio.h> // библиотека, необходимая для работы оператора getch();

void main()

{ float r,v;

int n;

scanf("%d%f",&n,&r);

n=abs(n*3);

v=3.14*r*r*(1-n%(n-1))+4./3*3.14*r*r*r*( n%(n-1));

printf("%f", v);

getch();

}

#include<stdio.h>

#include<conio.h>

#include<stdlib.h>

#include<time.h>

#define N 20

void main()

{int i,j,k,bag,a[N],b[N],N2=N/2;

srand(time(NULL));

for(i=0;i<N;i++)

{a[i]=(rand()*89)/RAND_MAX+10;

printf("%d ",a[i]);

}

printf("\n\n");

for(i=0;i<N2;i++)

for(j=i;j<N2;j++)

{if(a[i]>a[j]) { bag=a[i]; a[i]=a[j]; a[j]=bag; };

if(a[i+N2]>a[j+N2]) { bag=a[i+N2]; a[i+N2]=a[j+N2]; a[j+N2]=bag; };

}

for(i=0;i<N2;i++) printf("%d %d\n",a[i],a[i+N2]); printf("\n");

for(i=0,j=N2,k=0;(j<N)*(i<N2);k++)

{if(a[i]<a[j]) {b[k]=a[i]; i++;}

else {b[k]=a[j]; j++;}

}

while(i<N2) {b[k]=a[i]; i++; k++;};

while(j<N) {b[k]=a[j]; j++; k++;};

for(i=0;i<N;i++) printf("%d ",b[i]);

getch();

}

1 1

2 4

3 9

4 16

5 25

6 36

7 49

8 64

9 81

10 100

#include<stdio.h>

void main()

{

FILE*f;

int i;

f=fopen("square.txt","w");

for(i=1;i<=10;i++)

fprintf(f,"%d %d\n",i,i*i);

fclose(f);

}

По всей видимости файл пустой

#include<stdio.h>

#include<conio.h>

void main()

{

FILE*f;

char c;

f=fopen("output.txt","r");

fscanf(f,"%c",&c);

while(!feof(f))

{

printf("%c",c);

fscanf(f,"%c",&c);

}

fclose(f);

getch();

}

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#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

{

FILE*f1;

float t,dt=0.01,x1=1,x2=1;

f1=fopen("Graph.txt","w");

for (t=0;t<=2;t=t+dt)

{

fprintf(f1,"%f ",t);

fprintf(f1,"%f %f ",exp(-t),x1);

fprintf(f1,"%f %f\n",exp(t),x2);

x1=x1-x1*dt;

x2=x2+x2*dt;

}

fclose(f1);

}

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19.300000 43.535035 43.536536

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19.500000 60.552616 60.553987

19.600000 68.195079 68.196362

19.700000 75.156160 75.157342

19.800000 81.366306 81.367374

19.900000 86.763469 86.764410

20.000000 91.293721 91.294525

20.100000 94.911797 94.912455

20.200000 97.581548 97.582052

20.300000 99.276298 99.276641

20.400000 99.979114 99.979290

20.500000 99.682973 99.682979

20.600000 98.390835 98.390669

20.700000 96.115609 96.115272

20.800000 92.880029 92.879523

20.900000 88.716425 88.715753

21.000000 83.666397 83.665564

21.100000 77.780404 77.779416

21.200000 71.117255 71.116122

21.300000 63.743528 63.742260

21.400000 55.732898 55.731505

21.500000 47.165404 47.163900

21.600000 38.126650 38.125049

21.700000 28.706948 28.705265

21.800000 19.000416 18.998668

21.900000 9.104039 9.102242

22.000000 -0.883303 -0.885131

22.100000 -10.861819 -10.863660

22.200000 -20.731807 -20.733642

22.300000 -30.394650 -30.396461

22.400000 -39.753800 -39.755568

22.500000 -48.715744 -48.717451

22.600000 -57.190936 -57.192566

22.700000 -65.094697 -65.096231

22.800000 -72.348054 -72.349476

22.900000 -78.878535 -78.879829

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23.100000 -89.517738 -89.518737

23.200000 -93.520159 -93.520992

23.300000 -96.588158 -96.588815

23.400000 -98.691082 -98.691556

23.500000 -99.807919 -99.808203

23.600000 -99.927510 -99.927599

23.700000 -99.048660 -99.048552

#include<stdio.h>

#include<conio.h>

#include<math.h>

#define dt 0.5

void main()

{

FILE*file;

double x,x0,v,v0,A,fi,t;

double kv1,kv2,kv3,kv4,kx1,kx2,kx3,kx4;

x0=0; v0=100;

file=fopen("x.txt","w");

A=sqrt(x0*x0+v0*v0);

fi=atan(x0/v0);

for (x=x0,v=v0,t=0;t<=200;t=t+dt)

{

fprintf(file,"%lf %lf %lf\n",t,x,A*sin(t+fi));

kv1=dt*-x;

kx1=dt*v;

kv2=dt*-(x+kx1/2);

kx2=dt*(v+kv1/2);

kv3=dt*-(x+kx2/2);

kx3=dt*(v+kv2/2);

kv4=dt*-(x+kx3);

kx4=dt*(v+kv3);

x=x+(kx1+2*kx2+2*kx3+kx4)/6;

v=v+(kv1+2*kv2+2*kv3+kv4)/6;

}

fclose(file);

}

#include <stdio.h>

#include <math.h>

#include <conio.h>

void main()

{

double s=1.,sum=0.,eps,x,x1;

int n=1;

scanf("%lf%lf",&x,&eps);

while(fabs(s*x/n)>eps)

{

s=s*x/n;

sum=sum+s;

n++;

}

sum++;

printf("\n%.12lf",sum);

getch();

}

#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

{

double a,b,eps,dx,s,s1=0,sold;

int i=2,n;

scanf("%lf%lf%lf",&a,&b,&eps);

dx=fabs(b-a);

s=(b-a)*a*a;

dx=dx/2.;

sold=s+1;

while(fabs(s-sold)>eps)

{

sold=s;

n=1; s1=0;

while(n<=i-1)

{

s1=s1+dx*(dx*n+a)*(a+dx*n);

n=n+2;

}

s=s/2+s1;

dx=dx/2;

i=i*2;

}

printf("\n%lf",s);

printf("\n%lf",fabs(a*a*a-b*b*b)/3);

getch();

}

#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

{

double a,b,eps,dx,s=0,sold;

int i=2,n,steps;

scanf("%lf%lf%lf",&a,&b,&eps);

dx=fabs(a-b);

s=dx*(b*b+a*a)/2.;

dx=dx/2.;

sold=s+1;

steps=1;

for(;fabs(s-sold)>eps;i=i*2)

{

sold=s;

for(s=0,n=0;n<i;n++)

s=s+dx*((dx*n+a)*(dx*n+a)+(dx*(n+1)+a)*( dx*(n+1)+a))/2;

dx=dx/2;

steps++;

}

printf("%lf steps=%d",s,steps);

printf("\n%lf",fabs(a*a*a-b*b*b)/3);

getch();

}