Question: Please help me to write a program to check telephone number validity . just check all characters are 0~9 1.C language 2.Please use printfno scanfgets....

Please help me to write a program to check telephone number validity . just check all characters are "0"~"9" 1.C language 2.Please use "printf"no scanfgets.... 3.only argv ,argc accepted 4.Please explain the steps cause I'm a beginner hhhhh Thank you soooooo much!!!!!

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