Web Reference: Jan 10, 2025 · If the character passed is a lowercase alphabet then the toupper () function converts a lowercase alphabet to an uppercase alphabet. It is defined in the ctype.h header file. This page contains document on toupper () function in C programming with example and explanation. Oct 28, 2024 · Master C's toupper () function with practical examples and best practices. Learn text case conversion techniques to enhance your C programming skills today.
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