A simple compiler

compiler.c

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
	FILE *f;
	char op;
	int a, b;
	scanf("%c %d %d", &op, &a, &b);

	f = fopen("/tmp/temp.c", "w");
	fprintf(f, "#include <stdio.h>\n");
	fprintf(f, "#include <stdlib.h>\n");
	fprintf(f, "int main(int argc, char *argv[]) {\n");
	switch (op) {
	case '+': fprintf(f,"printf(\"%%d\", %d + %d);\n", a, b); break;
	case '-': fprintf(f,"printf(\"%%d\", %d - %d);\n", a, b); break;
	}
	fprintf(f, "exit(0);\n");
	fprintf(f, "}\n");
	fclose(f);
	system("cc -o /tmp/temp /tmp/temp.c");
	exit(0);
}