test.c:5: warning: no previous prototype for 'sleep'
test.c: In function 'sleep':
test.c:10: warning: comparison between signed and unsigned
test.c: At top level:
test.c:20: warning: return type of 'main' is not 'int'
test.c:20: warning: 'main' takes only zero or two arguments
test.c: In function 'main':
test.c:26: warning: passing argument 1 of 'sleep' as floating rather than integer due to prototype
test.c:26: warning: unused variable 'j'
test.c: In function 'sleep':
test.c:18: warning: control reaches end of non-void function
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