string - Copying 0 as 000 in C++? -

this question answered. nothing formatters instead idiocy when comes copying new buffers.

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i'm hoping 1 line answer. have snprintf() statement following:

snprintf(buffer, sizeof(buffer), "%03d", 0u); 

i'm expecting buffer hold 000 reason holds 00. assume buffer plenty large enough hold want. being silly?

edit:

see below complete code context. trying simplify before didn't think context necessary. point still remains, using %04u gives me 000 in first csv row. %03u gives me 00.

uint16_t csvgenerator::write_csv_data(testrecord* record) {     // define templates.     const char *row_template = "%04u,%6.3e,%6.3e,%6.3e,%6.3e,%6.3e\n";     char csv_row_buffer[csv_row_buffer_size];      // add data.     uint16_t row_count = 0u;    (uint16_t reading = 0u; reading < measure_reading_count; ++reading)    {        // parse row.        snprintf(csv_row_buffer, sizeof(csv_row_buffer), row_template,                // test id                measure_period_secs * reading,                // impedances z1-z5.                record->measurements[reading][0u],                record->measurements[reading][1u],                record->measurements[reading][2u],                record->measurements[reading][3u],                record->measurements[reading][4u]);         // add main buffer, excluding terminator.        strncpy((m_csv_data_buffer + (reading * csv_row_buffer_size) - 1u),                csv_row_buffer, (sizeof(csv_row_buffer) - 1u));         // increment row count.        ++row_count;    } // : each reading.     return row_count; } 

how check contains "000"? if reading (m_csv_data_buffer + (reading * csv_row_buffer_size)) losing first byte since you've copied (m_csv_data_buffer + (reading * csv_row_buffer_size) - 1u) in code.