int main()
{
double a[20];
double result = 0.0;
int i = 0;
double fact = 3.2;
double val = 1.5;
double *ptrDouble = &a[0];
//输出所有数组值
for (i = 0; i<20;i++)
{
*(ptrDouble + i) = i*fact+val;
printf("%f ",*(ptrDouble + i));
}
ptrDouble = &a[10];
//输出后是个值
for (i = 0; i<10;i++)
{
result = result + *(ptrDouble+i);
}
printf("%f",result);
};
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