'Default printf' presentation slideshows

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????????????

??. ?? , ?? , ?? ???. no. no. no. no. ?? = +. ?? = -. ?? = *. ?? = /. yes. yes. yes. yes. ???. ???. ???. ???. ????. ?????. ??. ????????????. if ?? switch ?? ?????. ???????? 1 if ?. else if(kigo=='-') { c=a-b; printf("%d - %d = %d ",a,b,c); }

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Problems

Problems. Reads a letter grade from user and displays the corresponding range for that letter grade (A ?90-100, B?80-89, C?70-79, D?60-69, otherwise F) Modify the above problem to accept lower or uppercase letter grades.

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