Simple array
/*********************************************************/
/* array1.cpp - VC5.0 */
/* Simple array */
/* J Luo, 20-Mar-2001 */
/*********************************************************/
#include <stdio.h>
void main()
{
float x[3];
float sum;
float mean;
printf("Input your data, please ... \n");
sum = 0;
for (int i=0; i<3; i++)
{
printf("x(%d) = ", i);
scanf("%f", &x[i]);
printf("x(%d) = \t %f \n", i, x[i]);
sum = sum + x[i];
}
mean = sum/3;
printf("Sum = %f\n", sum);
printf("Mean = %f\n", mean);
}
Output
Input your data, please ...
x(0) = 12.3
x(1) = 45.6
x(2) = 78.9
12.30 45.60 78.90
Sum = 136.80
Mean = 45.600
/*********************************************************/
/* array1.cpp - VC5.0 */
/* With a constant */
/* J Luo, 20-Mar-2001 */
/*********************************************************/
#include <stdio.h>
void main()
{
const n=3;
float x[n];
float sum;
float mean;
int i;
printf("Input your data, please ... \n");
sum = 0;
for (i=0; i<n; i++)
{
printf("x(%d) = ", i);
scanf("%f", &x[i]);
sum = sum + x[i];
}
mean = sum/n;
for (i=0; i<n; i++) printf("%6.2f\t", x[i]);
printf("\n");
printf("Sum = %6.2f\n", sum);
printf("Mean = %6.3f\n", mean);
}
N and n
/*********************************************************/
/* array1.cpp - VC5.0 */
/* With constant */
/* J Luo, 20-Mar-2001 */
/*********************************************************/
#include <stdio.h>
void main()
{
const int N=100;
float x[N];
float sum;
float mean;
int n;
int i;
printf("No of data n = ");
scanf("%d", &n);
printf("%d", n);
sum = 0;
printf("Input your data, please ... \n");
for (i=0; i<n; i++)
{
printf("x(%d) = ", i);
scanf("%f", &x[i]);
sum = sum + x[i];
}
mean = sum/n;
for (i=0; i<n; i++) printf("%6.2f\t", x[i]);
printf("\n");
printf("Sum = %6.2f\n", sum);
printf("Mean = %6.3f\n", mean);
}
Mean and SD
/*********************************************************/
/* mean_sd.cpp - VC5.0 */
/* Mean and SD */
/* My FIRST useful C program */
/* J Luo, 14-Feb-2001 */
/* Modified, J Luo, 20-Mar-2001 */
/*********************************************************/
#include <stdio.h>
#include <math.h>
void main()
{
const int N=1000;
float x[N];
int n;
float sumX1, sumX2;
float mean;
float SD;
int i;
printf("No of data n = ");
scanf("%d", &n);
printf("%d", n);
printf("Input your data, please ... \n");
sumX1 = 0;
sumX2 = 0;
for (i=0; i<n; i++)
{
printf("x(%d) = ", i);
scanf("%f", &x[i]);
sumX1 = sumX1 + x[i];
sumX2 = sumX2 + x[i]*x[i];
}
mean = sumX1/n;
SD = (float)sqrt( (sumX2 - sumX1*sumX1/n) / (n-1) );
for (i=0; i<n; i++) printf("%6.2f\t", x[i]);
printf("\n");
printf("Mean = %6.3f\n", mean);
printf(" SD = %6.3f\n", SD);
}
T-test
/*********************************************************/
/* sort_swap.cpp - VC5.0 */
/* Swap sorting */
/* J Luo, 28-Mar-2001 */
/*********************************************************/
#include <stdio.h>
void main()
{
int a[] = {5,6,2,9,10,3,4,7,8,1};
int n;
int i, j;
int temp;
n = sizeof(a) / sizeof(int);
printf("Before sorting ... \n");
for (i=0; i<n; i++) printf("%d\t", a[i] );
printf("\n");
for (i=0; i<n; i++)
{
for (j=i+1; j<n; j++)
{
if ( a[j] < a[i] )
{
temp = a[i];
a[i] = a[j];
a[j] = temp;
}
}
}
printf("After sorting ... \n");
for (i=0; i<n; i++) printf("%d\t", a[i] );
printf("\n");
}
Select sorting
/*********************************************************/
/* sort_select.cpp - VC5.0 */
/* Select sorting */
/* J Luo, 28-Mar-2001 */
/*********************************************************/
#include <stdio.h>
void main()
{
int a[] = {5,6,2,9,10,3,4,7,8,1};
int n;
int i, j, k;
int temp;
n = sizeof(a) / sizeof(int);
printf("Before sorting ... \n");
for (i=0; i<n; i++) printf("%d\t", a[i] );
printf("\n");
for (i=0; i<n; i++)
{
k = i;
for (j=i+1; j<n; j++)
{
if ( a[j] < a[k] ) k = j;
}
temp = a[i];
a[i] = a[k];
a[k] = temp;
}
printf("After sorting ... \n");
for (i=0; i<n; i++) printf("%d\t", a[i] );
printf("\n");
}
Bubble sort
/*********************************************************/
/* sort_bubble1.cpp - VC5.0 */
/* Bubble sort */
/* J Luo, 28-Mar-2001 */
/*********************************************************/
#include <stdio.h>
void main()
{
int a[] = {5,6,2,9,10,3,4,7,8,1};
int n;
int i, j;
int temp, flag;
n = sizeof(a) / sizeof(int);
printf("Before sorting ... \n");
for (i=0; i<n; i++) printf("%d\t", a[i] );
printf("\n");
for (i=0; i<n; i++)
{
flag=0;
for (j=n; j>i; j--)
{
if ( a[j] < a[j-1] )
{
temp = a[j];
a[j] = a[j-1];
a[j-1] = temp;
flag=1;
}
}
if (flag==0) break;
}
printf("After sorting ... \n");
for (i=0; i<n; i++) printf("%d\t", a[i] );
printf("\n");
}
Insert sorting
/*********************************************************/
/* sort_insert.cpp - VC5.0 */
/* Insert sorting */
/* J Luo, 28-Mar-2001 */
/*********************************************************/
#include <stdio.h>
void main()
{
int a[] = {5,6,2,9,10,3,4,7,8,1};
int n;
int i, j;
int temp;
n = sizeof(a) / sizeof(int);
printf("Before sorting ... \n");
for (i=0; i<n; i++) printf("%d\t", a[i] );
printf("\n");
for (i=1; i<n; i++)
{
temp = a[i];
for (j=i-1; j>=0; j--)
{
if ( temp < a[j] ) a[j+1] = a[j];
else break;
}
a[j+1] = temp;
}
printf("After sorting ... \n");
for (i=0; i<n; i++) printf("%d\t", a[i] );
printf("\n");
}
Matrix multiplication
/*********************************************************/
/* matrix.cpp - VC5.0 */
/* Matrix multiplication */
/* Swap sorting of string */
/* J Luo, 28-Mar-2001 */
/*********************************************************/
#include <stdio.h>
#include <string.h>
void main()
{
int a[2][3] =
{
{1, 2, 3},
{3, 2, 1}
};
int b[3][4] =
{
{0, 0, 0, 1},
{0, 1, 0, 1},
{1, 1, 0, 0}
};
int c[2][4];
int i, j, k;
for (i=0; i<2; i++)
{
for (j=0; j<3; j++)
{
printf("%d\t", a[i][j]);
}
printf("\n");
}
printf("\n");
for (i=0; i<3; i++)
{
for (j=0; j<4; j++)
{
printf("%d\t", b[i][j]);
}
printf("\n");
}
printf("\n");
for (i=0; i<2; i++)
{
for (j=0; j<4; j++)
{
c[i][j] = 0;
for (k=0; k<3; k++)
{
c[i][j] = c[i][j] + a[i][k] * b[k][j];
}
}
}
for (i=0; i<2; i++)
{
for (j=0; j<4; j++)
{
printf("%d\t", c[i][j]);
}
printf("\n");
}
printf("\n");
}
1 2 3
3 2 1
0 0 0 1
0 1 0 1
1 1 0 0
3 5 0 3
1 3 0 5
Sine Curve
/*********************************************************/
/* sine.cpp - VC5.0 */
/* Print out since curve */
/* J Luo, 28-Mar-2001 */
/*********************************************************/
#include <stdio.h>
#include <math.h>
void main()
{
const float pi = 3.1415927F;
const int N = 51;
char plot[N][N];
int x, y;
int np, nc;
float r;
for (x=0; x<N; x++)
{
for (y=0; y<N; y++)
{
plot[x][y] = ' ';
}
}
r = 2*pi / (N-1); // 2*pi/360
np = (N-1) / 2;
nc = np + 1;
for (x=0; x<N; x++)
{
y = (int) ( np * sin(x*r) + nc );
plot[x][nc] = '|';
plot[x][y] = '*';
}
for (x=0; x<N; x++)
{
for (y=0; y<N; y++)
{
printf("%c", plot[x][y]);
}
printf("\n");
}
}
Output
*
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
*|
* |
* |
* |
* |
* |
* |
* |
* |
* |
* |
* |
* |
* |
* |
* |
* |
* |
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* |
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*