Program

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <string.h>

typedef char string [128];
main(){
string memory [16] = {0};
string search;
int choice;
int i;
int size = 0;
while(1){
system("CLS");
int found = 0;
printf("Command prompt\n");
printf("1.) Enter string in database\n");
printf("2.) Remove a string from database\n");
printf("3.) View strings in database\n");
printf("4.) Search a string\n");
printf("5.) Exit.\n");
printf("Choose a number that you want to do.\n");
scanf("%d", &choice);

switch(choice){

case 1:
printf("Entry #%d: ",size + 1);
while(getchar()!='\n');
gets(memory[size]);
size++;
break;
case 2:
printf("Enter entry number: ");
scanf("%d",&choice);
choice--;
for (i=choice; i<size ; i++)
strcpy(memory[i],memory[i+1]);
size--;
break;

case 3:
for (i = 0; i < size; i++)
printf("Entry #%d: %s\n",i+1,memory[i]);
break;
case 4:
printf("Search: ");
while(getchar()!='\n');
gets(search);
// linear search
i = 0;
for (; i< size; i++)
if (strcmp(search,memory[i])==0){
found = 1;
break;
}

if (found)
printf("Data is found in number#%d: %s", i+1,search);
else
printf("Data not found.");

break;

case 5:
exit(1);
break;
}
printf("\n");
system("pause");
}
}

polynomial

#include <stdio.h>
#include <stdlib.h>
#include <math.h>



main()
{
system("cls");
int a[10];
int order, constant, i, power;
float sum,x;
system ("cls");
printf("Enter the order of the polynomial\n");
scanf("%d", &order);

printf("Enter constant for x\n");
scanf("%d", &constant);


printf("Enter %d coefficients\n", order+1);
for (i=0; i<= order; i++)
{
scanf("%d", &a[i]);
}
sum = a[0];
for (i=1; i<= order; i++)
{
sum = sum*constant + a[i];
}

power = order;

printf("Given polynomial is:\n");
for (i=0;i<=order;i++)
{
if (power < 0)
{
break;
}
if (a[i] > 0)
printf("+");
else if (a[i] < 0)
printf("-");
else
printf(" ");
printf("%dx^%d", abs(a[i]), power--);
}
printf("\nSum of the polynomial = %6.2f\n\n", sum);

system("pause");

}
mult

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

main()
{
int m1[10][10],i,j,k,m2[10][10],mult[10][10],r1,c1,r2,c2;
printf("Enter number of rows and columns of first matrix (less than 10)\n");
scanf("%d%d",&r1,&c1);
printf("Enter number of rows and columns of second matrix (less than 10)\n");
scanf("%d%d",&r2,&c2);
if(r2==c1)
{
printf("Enter rows and columns of First matrix \n");
printf("Row wise\n");
for(i=0;i<r1;i++)
for(j=0;j<c1;j++)
scanf("%d",&m1[i][j]);
printf("First Matrix is :\n");
for(i=0;i<r1;i++)
{
for(j=0;j<c1;j++)
printf("%d\t",m1[i][j]);
printf("\n");
}
printf("Enter rows and columns of Second matrix \n");
printf("Row wise\n");
for(i=0;i<r2;i++)
for(j=0;j<c2;j++)
scanf("%d",&m2[i][j]);
printf("Second Matrix is:\n");
for(i=0;i<r2;i++)
{
for(j=0;j<c2;j++)
printf("%d\t",m2[i][j]);
printf("\n");
}
printf("Multiplication of the Matrices:\n");
for(i=0;i<r1;i++)
{
for(j=0;j<c2;j++)
{
mult[i][j]=0;
for(k=0;k<r1;k++)
mult[i][j]+=m1[i][k]*m2[k][j];
printf("%d\t",mult[i][j]);
}
printf("\n");
}
}
else
{
printf("Matrix multiplication cannot be done");
}
system("pause");

}

Not sure why you posted this but could you surround your code with code tags and possibly try formatting it?

Click here links to a website targeted for working code:
http://code.activestate.com/recipes/langs/c/

I tried your polynomial program.

Zeroth: the program doesn't port well to my operating system.

First off, it doesn't tell me whether to order the coefficients from constant toward higher power terms or the other way around.

Secondly, I used 0 for some of the coefficients. The polynomial displays incorrectly.

(I think there was also a system("pause"); statement which I deleted before compilation. Likewise, it wouldn't have worked on my operating system.)




(also, I'm sure that your program would break if I entered a 40th order polynomial.)