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Why is it usually a bad idea to use gets()? Suggest a workaround.
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The function gets() reads characters from the stdin and stores them at the provided input buffer. However, gets() will keep reading until it encounters a newline character. Unless the buffer is large enough, or the length of the line being read is known ahead of time, gets() can potentially overflow the input buffer and start overwriting memory it is not supposed to, wreaking havoc or opening security vulnerabilities.
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A.C func() { pritnf(" in fuction %d",MACRO); } MAIN.c testfunc() { #define MACRO 10 printf("in test function %d", MACRO); } main() { printf("in main %d",MACRO); func(); testfunc(); getch(); }
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a number is perfect if it is equal to the sum of its proper divisor.. 6 is perfect number coz its proper divisors are 1,2 and three.. and 1+2+3=6... a number is deficient if the sum of its proper divisor is less than the number.. sample: 8 is deficient, coz its proper divisors are 1,2 and 4, and 1+2+4=7. abundant number, if the sum of its proper divisor is greater than the number.. sample..12 is abundant coz 1+2+3+4+6=16 which is geater than 12. now write a program that prompts the user for a number, then determines whether the number is perfect,deficient and abundant..
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C 
