求大神解答C語言編程作業

#include<stdio.h>

int?main()

{int?n,k;

char?s[3][3]={"th","st","rd"};

while(1)

{

printf("Enter?a?positive?integer:");

scanf("%d",&n);

k=(n%10==0||n%10>2)?0:n%10;

if(n==-1)break;

printf("Sum?up?to?%d%s?term?=?%d\n\n",n,s[k],(3*n+7)*n/2);

}

return?0;

}

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