OJ Board

Why WA...plz help me :(

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

int main()
{
int i,n;
double s,a,u,v,t;

for(i=1;;i++){
scanf("%d",&n);

if(n==0){
break;
}

if(n==1){
scanf("%lf %lf %lf",&u,&v,&t);

s=((u+v)/2.0)*t;
a=(v-u)/t;

printf("Case %d: %.3lf %.3lf\n",i,s,a);
}
if(n==2 ...

getting run time error....how...why :o

#include <stdio.h>

int main()
{
int i,j,m,n,a[100],sum,std;
double average,percentage;

scanf("%d",&n);

for(i=1;i<=n;i++){
scanf("%d",&m);
sum=0;
std=0;
for(j=0;j<m;j++){
scanf("%d",&a[j]);
sum+=a[j];
}
average=sum/m;
for(j=0;j<m;j++){
if ...