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#include<stdio.h>
main()
{
int i,j,d=1,n,a[10][10],k;

printf(“enter the limit\n”);
scanf(“%d”,&n);
for(i=0;i<n;i++)
for(j=0;j<n;j++)
a[i][j]=0;

printf(“Magic Matrix is:\n”);
i=0;
j=n/2;
while(d<=(n*n))
{
a[i][j]=d;
d++;
i–;
j++;
if(i<0)
i=i+n;
if(j==n)
j=j-n;

if(a[i][j]!=0)
{
i+=2;
j–;
if(i>=n)
i=i-n;
if(j<0)
j=j+n;
}
}
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
printf(“%d\t”,a[i][j]);
}
printf(“\n”);
if(n==9)
{
for(k=0;k<n-2;k++)
printf(“———-”);
printf(“\n”);
}
if(n==3)
{
for(k=0;k<n;k++)
printf(“——”);
printf(“\n”);

}
if(n==7)
{
for(k=0;k<n-1;k++)
printf(“———”);
printf(“\n”);

}

}

}

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//Program to check whether number is even or odd using function.

#include<stdio.h>int iseven(int);main(){ int n,a[100],i,x; printf(“ENTER LIMIT\n”); scanf(“%d”,&n); printf(“ENTER AN ARRAY ELEMENT\n”); for(i=0;i<n;i++) { scanf(“%d”,&a[i]); } for(i=0;i<n;i++) { if(iseven (a[i])==1) printf(“\tEVEN=%d\n”,a[i]); else printf(“\tODD=%d\n”,a[i]); }}int iseven (int x){ if (x%2==0) return 1; else return 0;}

#include<stdio.h>
main()
{
int choice,r,i,r1,r2,r3,i1,i2,i3;
do
{
printf(“\n\t 1.ADD\n”);
printf(“\n\t 2.SUBTRACT\n”);
printf(“\n\t 3.MULTIPLY\n”);
printf(“\n\t 4.EXIT\n”);
printf(“\n\t ENTER UR CHOICE\n”);
scanf(“%d”,&choice);
printf(“\n\t ENTER 1ST COMPLEX NUMBER\n”);
scanf(“%d+%di”,&r1,&i1);
printf(“\n\t ENTER 2ND COMPLEX NUMBER\n”);
scanf(“%d+%di”,&r2,&i2);
switch(choice)
{
case 1: r3=r1+r2;
i3=i1+i2;
printf(“(%d+%d)+(%d+%d) is (%d+%d)”,r1,i1,r2,i2,r3,i3);
break;
case 2: r3=r1-r2;
i3=i1-i2;
printf(“(%d+%d)-(%d+%d) is (%d+%d)”,r1,i1,r2,i2,r3,i3);
break;
case 3: r3=r1*r2;
i3=i1*i2;
printf(“(%d+%d)*(%d+%d) is (%d+%d)”,r1,i1,r2,i2,r3,i3);
break;
}
}while(choice!=4);
}

//Program to check whether the character is an alphabet or digit or punctuation symbol and if alphabet check if it is uppercase or lowercase and then change it.

#include<stdio.h>
main()
{
char ch;
int choice;
do
{
printf(“\n\t MENU \n”);
printf(“\n\t 1.CHECK ALPHABET”);
printf(“\n\t 2.CHECK DIGIT”);
printf(“\n\t 3.CHECK PUNCTUATION SYMBOL”);
printf(“\n\t 4.EXIT\n”);
printf(“ENTER MENU CHOICE\n”);
scanf(“%d”,&choice);
printf(“ENTER CHARACTER\n”);
scanf(“%c”,&ch);
ch=getchar();
switch(choice)
{
case 1:if(isalpha(ch))
{
if(islower(ch))
ch=toupper(ch);
else
ch=tolower(ch);
}
printf(“CONVERTED CHARACTER=%c”,ch);
break;
case 2:if(isdigit(ch))
printf(“CHARACTER IS DIGIT”);
else
printf(“CHARACTER IS NOT A DIGIT”);
break;
case 3:if(ispunct(ch))
printf(“CHARACTER IS A PUNCTUATION SYMBOL”);
else
printf(“CHARACTER IS NOT A PUNCTUATION SYMBOL”);
break;
}
}
while(choice!=4);
}

#include<stdio.h>
#include<math.h>
main()
{
int i,p=i,sum=0,j,x,y;
printf(“Enter limits of perfect numbers\n”);
scanf(“%d%d”,&x,&y);
for(i=x;i<=y;i++)
{
p=i;
sum=0;
for(j=1;j<p;j++)
{
if(p%j==0)
sum+=j;
}
if(p==sum)
printf(“\nPerfect Numbers=%d\t\n\n”,p);
}
}