C Programming-Some Fun With Maths

A PROGRAM TO FIND WHETHER A GIVEN NO IS PRIME .

#include

int main(){

int number,index,x,y;
x=0;
printf("Enter The Number: ");
scanf("%i", &number);
if (number>0){
for(index=1;index<=sqrt(number);index++){ y=number%index; if(y==0){ x=x+1; } } if(x==1&&number>1){
printf("HEY IT'S A PRIME NO \n");
}else{
printf("OH NO IT'S NOT A PRIME NO \n");
}
}

return 0;
}



A PROGRAM TO FIND WHETHER A GIVEN NO IS A PERFECT NO .



#include
int main(){
int number, index, sum;
sum=0;
printf("Enter the Number: ");
scanf("%d" ,&number);

if(number>0){
for(index=1;index<=number/2;index++){ if(number%index==0){ sum+=index; } } if(sum==number){ printf("Hey it's a prfect No \n"); }else{ printf("U fool it's not a perfect no \n"); } } return 0; } 



SOME FUN WITH STARS. 


#include
int main(){
int number,x,y;

printf(" Enter the value which u want printed: ");
scanf("%d", &number);

for(x=number;x>0;x--){
for(y=0;y
printf("*");
}
printf("\n");
}

for(x=0;x
for(y=0;y<=x;y++){ printf("*"); } printf("\n"); } return 0; }