1. Write a program to calculate approximate value of e, with following equation, input the value...

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1. Write a program to calculate approximate value of e, with following equation, input the value of n from the keyboard, e=1+1/1!+1/2+1/3+...1/n!. Keep 4 digits after the decimal point. 2. Input the scores of two courses which are JAVA and Mathematics from the keyboard, and output the corresponding level for both courses according to the following grading system: score: level 0-59: E, 60-69: D, 70-79: C, 80-89: B, 90-100: A 3. Print all the "narcissus numbers" in the range of 100-1000. The so-called "narcissus number" refers to a three-digit number, whose cube sum equals the number itself. For example, 153 is a "narcissus number" because 1^3 +5^3 + 3^3 = 153. 1. Write a program to calculate approximate value of e, with following equation, input the value of n from the keyboard, e=1+1/1!+1/2+1/3+...1/n!. Keep 4 digits after the decimal point. 2. Input the scores of two courses which are JAVA and Mathematics from the keyboard, and output the corresponding level for both courses according to the following grading system: score: level 0-59: E, 60-69: D, 70-79: C, 80-89: B, 90-100: A 3. Print all the "narcissus numbers" in the range of 100-1000. The so-called "narcissus number" refers to a three-digit number, whose cube sum equals the number itself. For example, 153 is a "narcissus number" because 1^3 +5^3 + 3^3 = 153.

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