16892 Developer Q&A Community

asked Feb 5, 2021 in Others[杂七杂八] by ostack (1.4k points)

Welcome to Our Knowledge Sharing Community-Open, Learning,Share

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asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

arrays - "Notice: Undefined variable", "Notice: Undefined index", and "Notice: Undefined offset" using PHP

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204 views 1 answer

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

c - Do I cast the result of malloc?

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159 views 1 answer

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

How to avoid using Select in Excel VBA

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59 views 1 answer

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

c++ - Why is "using namespace std;" considered bad practice?

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255 views 1 answer

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

javascript - Why does jQuery or a DOM method such as getElementById not find the element?

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271 views 1 answer

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

python - How to test multiple variables against a single value?

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77 views 1 answer

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

java - How can I fix 'android.os.NetworkOnMainThreadException'?

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229 views 1 answer

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

c++ - Where and why do I have to put the "template" and "typename" keywords?

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152 views 1 answer

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

html - How do I remove the space between inline/inline-block elements?

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205 views 1 answer

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

java - How to add JTable in JPanel with null layout?

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49 views 1 answer

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

How do I get PHP errors to display?

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58 views 1 answer

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

c++ - Undefined behavior and sequence points

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81 views 1 answer

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

r - Reshaping data.frame from wide to long format

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187 views 1 answer