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int main(int argc, char *argv[]) { int p,q; double f; printf("Please input p,q:\n"); scanf("%d",&p); scanf("%d",&q); f = q>=100 ?((p+q)/(2.*q)) : (q>0 && p<20) ? (p-2*q) : (p-3*q); printf("f=%lf\n",f); system("PAUSE"); return 0; }