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1. Java Programs Without Scanner
1.1 Write a program to perform addition, subtraction, multiplication, and division without using Scanner. Hint: Use fixed values like int a = 10, b = 20.
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1.2 Write a program to find the area of a square without using a Scanner. Hint: Use a fixed side value.
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1.3 Write a program to find the area of a rectangle without using a Scanner. Hint: Use fixed length and breadth.
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1.4 Write a program to find the area of a triangle without using a Scanner. Hint: (base × height) / 2.
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1.5 Write a program to find the area of a circle without using a Scanner. Hint: 3.14 × radius × radius.
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1.6 Write a program to calculate simple interest without using a Scanner. Hint: Use fixed P, R, T values.
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