C++ program to draw a line with given coordinates
codeaft.cpp
#include <graphics.h>
int main()
{
    int gd = 0, gm = 9;
    initgraph(&gd, &gm, NULL);
    setcolor(15);
    line(50, 50, 150, 150);
    delay(2000);
    return 0;
}
Output
codeaft@codeaft:~$ g++ codeaft.cpp -lgraph
codeaft@codeaft:~$ ./a.out
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