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sprintf

Holger Warzelhan

Hello!

I am trying to use sprintf, but get no result (C51, version 5.20).

char xdata command [80], i=100;
strcpy (command, "Hello!"); // now command contains "Hello!"
sprintf (command, "Test %d", i); // command has not changed
Why would sprintf not work?
Thank you for any help!
Holger

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  • 0

    All work OK (compiled and simulated in dScope).

    But without explicitly typecasting of 'i' you get wrong result 

    char xdata command [80], i=100;
sprintf (command, "Test %d", (int) i); // command has "Test 100"
sprintf (command, "Test %d", i); // command has "Test 25600"

    See advice of Mark Odell about 'integer promotion'.

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  • 0

    All work OK (compiled and simulated in dScope).

    But without explicitly typecasting of 'i' you get wrong result 

    char xdata command [80], i=100;
sprintf (command, "Test %d", (int) i); // command has "Test 100"
sprintf (command, "Test %d", i); // command has "Test 25600"

    See advice of Mark Odell about 'integer promotion'.

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