Question

The basic types are very simple - use int, float and double for numbers. In genneral, avoid float for plain C code as its lack of precision may bite you unless you are writing CUDA code. Strings are quite nasty to use in C - I would suggest doing all your string processing in Python ...

Structs are sort of like classes in Python

struct point {
    double x;
    double y;
    double z;
};

struct point p1 = {.x = 1, .y = 2, .z = 3};
struct point p2 = {1, 2, 3};
struct point p3;
p3.x = 1;
p3.y = 2;
p3.z = 3;

You can define your own types using typedef -.e.g.

#include <stdio.h>
struct point {
    double x;
    double y;
    double z;
};

typedef struct point point;

int main() {
    point p = {1, 2, 3};
    printf("%.2f, %.2f, %.2f", p.x, p.y, p.z);
};