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&bold(){Exersixe 4-1.}Write the function strrindex(s,t) , which returns the position of the  rightmost occurrence of t in s , or -1 if there is none. 
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&bold(){Exersixe 4-2.}Extend atof to handle scientific notation of the form 123.45e-6 where a floating-point number may be followed by e or E and an optionally signed exponent. 
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&bold(){Exersixe 4-3.}Given the basic framework, it's straightforward to extend the calculator. Add the modulus ( % ) operator and provisions for negative numbers. 
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&bold(){Exersixe 4-4.}Add commands to print the top element of the stack without popping, to duplicate it, and to swap the top two elements. Add a command to clear the stack. 
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&bold(){Exersixe 4-5.}Add access to library functions like sin , exp , and pow . See <math.h> in Appendix B, Section 4. 
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&bold(){Exersixe 4-6.}Add commands for handling variables. (It's easy to provide twenty-six variables with single-letter names.) Add a variable for the most recently printed value. 
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&bold(){Exersixe 4-7.}Write a routine ungets(s) that will push back an entire string onto the input. Should ungets know about buf and bufp , or should it just use ungetch ?
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&bold(){Exersixe 4-8.}Suppose that there will never be more than one character of pushback. Modify getch and ungetch accordingly. 
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&bold(){Exersixe 4-9.}Our getch and ungetch do not handle a pushed-back EOF correctly. Decide what their properties ought to be if an EOF is pushed back, then implement your design.
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&bold(){Exersixe 4-10.}An alternate organization uses getline to read an entire input line; this makes getch and ungetch unnecessary. Revise the calculator to use this approach.
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&bold(){Exersixe 4-11.}Modify getop so that it doesn't need to use ungetch. Hint: use an internal static variable. 
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&bold(){Exersixe 4-12.}Adapt the ideas of printd to write a recursive version of itoa ; that is, convert an integer into a string by calling a recursive routine. 
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&bold(){Exersixe 4-13.}Write a recursive version of the function reverse(s) , which reverses the string s in place. 
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&bold(){Exersixe 4-14.}Define a macro swap(t,x,y) that interchanges two arguments of type t . (Block structure will help.) 
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