Bcoz u r trying to access an argument which doesnt even exist...........
for exmple ./a.out --> argc=1
(argv[0]="./a.out",argv[1]=NULL(not exist))
./a.out 1st_arg --> argc=2
(argv[0]="./a.out",argv[1]="1st_arg",argv[2]=NULL(not exist));
resulting '0' as %d specifier is used the print NULL string .
instead if u use %s it'll give u sementation fault...
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