#include 
     
      void sum_diff(int n1,int n2, int sum,int diff){    sum=n1+n2;    diff=(n1>n2) ? n1-n2 : n2-n1;}int main(void){    int na,nb;    int wa=0,sa=0;        printf("请输入两个整数");        printf("整数A:");    scanf("%d",&na);    printf("整数B:");    scanf("%d",&nb);        sum_diff(na,nb,wa,sa); //调用后，这里的wa,sa被销毁，不复存在；另外函数返回值只能有一个，不能返回两个，所以函数返回值也解决不了         printf("%d,%d",wa,sa); //wa,sa的值都为0         return 0;}
     

 

#include 
     
      void sum_diff(int n1,int n2, int *sum,int *diff){    *sum=n1+n2;    *diff=(n1>n2) ? n1-n2 : n2-n1;}int main(void){    int na,nb;    int *wa;    int *sa;    wa=(int *)malloc(sizeof(int));    sa=(int *)malloc(sizeof(int));            printf("请输入两个整数");        printf("整数A:");    scanf("%d",&na);    printf("整数B:");    scanf("%d",&nb);        sum_diff(na,nb,wa,sa);         printf("%d,%d",*wa,*sa);     free(wa);
     

free(sa);

return 0; }