hello people

MY code is below and there is no error

but i dont really know whats wrong with my codes

when i run it it paint the circle (which it correct )

and then it take only one string and stop

but it should take two from user and concatinate them

please help

(IN C PROGRAMMING LANGUAGE )

#include

#include

#include

#include

void circle(int n){

int i,j;

for (i=0; i<=2*n; i++)

{

for (j=0; j<=2*n; j++)

{

double distance = sqrt((double)(i-n)*(i-n) + (j-n)*(j-n));

if (distance>n-0.5 && distance

{

printf("*");

}

else

{ printf(" ");}

}

printf(" ");

}

}

char *strCat(char *s1, char *s2){

int i,j=0;

int len = strlen(s1);

for(i=len; s2[j]!='\0';i++ ){

s1[i]=s2[j];

j++;

}

s1[i]='\0';

return s1;

}

int countS1(char *s1, char *s2)

{

int l1 = strlen(s1);

int l2 = strlen(s2);

int count = 0, i;

for(i = 0; i <= (l2-l1);i++)

{

int j;

for (j = 0; j < l1 ; j++)

if (s2[i+j] != s1[j])

break;

if (j == l1 )

{

count++;

j = 0;

}

}

return count;

}

int main()

{

int rad;

char *s1, *s2;

printf("Enter radius of circle: ");

scanf("%d", &rad);

circle(rad);

printf("Enter string one :");

scanf("%s", s1);

printf("Enter string two :");

scanf("%s",s2);

printf(" Number of times a substring (%s) is present in string (%s) is %d ", s1,s2, countS1(s1,s2));

printf("Concatination of two string : %s ", strCat(s1,s2));

return 0;

}

(in c langauage )