Verifying input data types programmatically: numeric validation with ISNUMBER, text verification with ISTEXT and ISNONTEXT, genuine blank checks with ISBLANK, and Boolean flags with ISLOGICAL.
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Spreadsheets mein data entry errors aur wrong data types ko identify karne ke diagnostic tools.
| Function | Checks If | Returns TRUE When |
|---|---|---|
=ISNUMBER(val) | Value is numeric | Real number or date serial (=ISNUMBER(250) → TRUE) |
=ISTEXT(val) | Value is text | Text or alphabet string (=ISTEXT("Hello") → TRUE) |
=ISNONTEXT(val) | Value is NOT text | Numbers, dates, booleans, or blanks |
=ISBLANK(val) | Cell is completely empty | Genuinely empty cell (no value, no formula) |
=ISLOGICAL(val) | Value is boolean | Logical TRUE or FALSE (not text "TRUE") |
[!WARNING] Quotes ke andar likha gaya number (jaise
"250") text hota hai, isliye=ISNUMBER("250")FALSE return karega!
"")=ISBLANK(A2): Sirf tab TRUE deta hai jab cell mein kuch bhi na ho (na koi number, na space, na formula)."" return kar raha hai, to ISBLANK FALSE dega!=IF(A2 = "", "Blank / Empty Text", "Has Content")
=IF(ISBLANK(A2), "Missing",
IF(ISNUMBER(A2), "Valid Number", "Review Entry"))
=IF(ISNUMBER(A2), "Valid", "Check Format").Practice live Excel formulas directly in your browser. Real calculation verified by HyperFormula.
Calculate total revenue in cell D6 by summing all items in column D (cells D2 to D5).
Every formula you enter is evaluated by a real spreadsheet engine in your browser — results are not pre-computed.
| # | A | B | C | D |
|---|---|---|---|---|
| 1 | Product | Quantity | Unit Price | Total |
| 2 | Laptop | 5 | 45000 | 225000 |
| 3 | Mouse | 20 | 500 | 10000 |
| 4 | Keyboard | 15 | 1200 | 18000 |
| 5 | Monitor | 8 | 12500 | 100000 |
| 6 | Grand Total |
5 practical questions testing data type inspection, formula auditing, and error shielding in Excel.
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Module 38: REST APIs, JSON Web Services & Cloud Integration
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