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%auto
%sage
def c(program):
    open("temp.c",'w').write(program)
    print os.popen("gcc temp.c -o a.out 2>&1 && ./a.out 2>&1").read()
default_mode('c')

#include<stdio.h>
int main(void) {
    printf("Hello world.\n");
}
Hello world. 
#include<stdio.h>
int main(void) {
    int n = 5, int m = 10;
    printf("Hello world: %d\n", n+m);
}
temp.c: In function ‘main’: temp.c:3:16: error: expected identifier or ‘(’ before ‘int’ int n = 5, int m = 10; ^ temp.c:4:35: error: ‘m’ undeclared (first use in this function) printf("Hello world: %d\n", n+m); ^ temp.c:4:35: note: each undeclared identifier is reported only once for each function it appears in 

#include<stdio.h>
int main(void) {
    int n = 5, m = 10;
    printf("Hello world: %d\n", n+m);
}
Hello world: 15