Program is the concrete realization of algorithm in a programming language
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The essence of computational thinking is abstraction and ( ).
A. recursion
B. loop
C. branch
D. automation
Which algorithm does playing chess embody ( )?
A. Greedy Algorithm
B. Artificial intelligence algorithm
C. Data mining algorithm
D. Backtracking algorithm
putchar function outputs a string to the terminal.
getchar function has no arguments.
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