foo.c:1:1: warning: return type defaults to 'int' [-Wreturn-type]
foo.c: In function 'main':
foo.c:4:3: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
foo.c:4:3: warning: incompatible implicit declaration of built-in function 'scanf' [enabled by default]
foo.c:5:3: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
foo.c:5:3: warning: incompatible implicit declaration of built-in function 'printf' [enabled by default]
foo.c:5:3: error: stray '\' in program
foo.c:5:14: error: expected ')' before 'n'
foo.c:5:14: warning: passing argument 1 of 'printf' makes pointer from integer without a cast [enabled by default]
foo.c:5:14: note: expected 'const char *' but argument is of type 'int'
foo.c:6:3: warning: control reaches end of non-void function [-Wreturn-type]