foo.c:12:11: error: invalid suffix "a000" on integer constant
foo.c: In function 'calc':
foo.c:23:9: warning: implicit declaration of function 'abs' [-Wimplicit-function-declaration]
foo.c: In function 'main':
foo.c:76:5: warning: implicit declaration of function 'memset' [-Wimplicit-function-declaration]
foo.c:76:5: warning: incompatible implicit declaration of built-in function 'memset' [enabled by default]