C language homework, the master comes quickly, the high score is given to you, speed

#include

void find(int *a,int k,int x) a is the array name, k is the array size, and x is the element to be found.

int counter1=0;

for(int i=0;i<=k;i++)if(a[i]==x)

Cout <, then replace Cin with Scanf, Cout with PrintF, and you're almost done!

Answer: A Error correction.

int p;

scanf("%d",&p);

int *p,a;

p=&a;scanf("%d",p);

Both of the above are fine.

Analysis: The compiler does not initialize the "local variable", the global variable is initialized to 0

Answer A cannot be used because it is not initialized before using the pointer variable p.

2.Answer B Error correction.

int *s,k;

s=&k;*s=100;

Pass a, both are pointers that are not initialized before use.

3.Answer C is correct.

4.Answer d is incorrect.

s=p;is wrong.

This is because s is an integer pointer and p is a character pointer. Two variables with different pointer types cannot be assigned.

I hope mine was helpful to you and it was a pleasure to learn and discuss C programming with you.

The pointers of A and B are null pointers, and D cannot be implicitly converted in C++, and an error will be reported.

CD is fine, AB is used without allocating memory.

Only C should be correct, and the last 2 lines of D have memory out-of-bounds issues.

In fact, no matter what kind of situation it is, according to the latitude and longitude, you can find the central angle of a and b, then the ground distance between the two is actually the arc length, assuming that the central angle is x (how to find it, I don't know, hehe).

#include

define pi

main()

double l,x,r;

r = 6371;Unit: km.

l = x * r;x is calculated based on latitude and longitude.

printf("%lf",l);

If you do the math, you can ask for it.