Compiler output
prog.c: In function 'quick_sort':
prog.c:11:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.c:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.c:34:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.c:39:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.c: In function 'letters':
prog.c:73:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.c:76:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.c:82:5: warning: function returns address of local variable [enabled by default]
prog.c: In function 'main':
prog.c:101:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.c:105:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
prog.c:112:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
