system and system2 in R [Software]

posted by Helmut Homepage – Vienna, Austria, 2022-08-30 13:25 (96 d 00:15 ago) – Posting: # 23243
Views: 609

Hi ElMaestro,

not sure why your original attempt failed.

A new one, missing the IO-declaration saved as FawltyTowers.c

int main() {
  printf("Hello, world!\n");
  return 0;
}

Then

x <- system(command = "gcc -Wall -O2 FawltyTowers.c -o FawltyTowers", intern = TRUE)
print(x)
[1] "FawltyTowers.c: In function 'main':"
[2] "FawltyTowers.c:2:3: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]"
[3] "    2 |   printf(\"Hello, world!\\n\");"
[4] "      |   ^~~~~~"
[5] "FawltyTowers.c:2:3: warning: incompatible implicit declaration of built-in function 'printf'"           
[6] "FawltyTowers.c:1:1: note: include '<stdio.h>' or provide a declaration of 'printf'"
[7] "  +++ |+#include <stdio.h>"
[8] "    1 | int main() {"

The compiler is tolerant (warnings not a problem). FawltyTowers.c compiled successfully to FawltyTowers.exe, which differs from hw.exe only in the leading bytes at addresses 00088 and 000DB.

system(command = "FawltyTowers", intern = TRUE)
[1] "Hello, world!"


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