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POHow to extract a number/byte from an array in C?
 

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  1. POHow to extract a number/byte from an array in C?
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    <p>Here i have written a code which produces next 8 numbers from sequence.</p> <pre><code>int next_exp_data(unsigned long long int expected_data) { int i=0; unsigned long long int seq_gen_value=1976943448883713; unsigned long long int temp_data[10]; temp_data[0]=seq_gen_value; for(i=0;i&lt;10;i++) { printf("%llu",temp_data[i]); putchar('\n'); expected_data=temp_data[i]; temp_data[i+1]=temp_data[i] +2260630401189896; } return (expected_data); } </code></pre> <p>I want to know how can i extract each byte/number of the array and return each number/byte ??Please help me out.</p> <p>EDIT:Here's my code.Basically i want to read a file and compare the contents to check if the data read matches with generated sequential data.Here the buffer contains same data as temp_data is producing(ie 10 numbers like 0x07060504030201 next 0f0e0d0c0b0a0908 etc).I want to comapre buffer's data and the function's data.Can anyone suggest me how can i do.I am stuck.Any changes are appreciated.</p> <pre><code> #include&lt;stdio.h&gt; #include&lt;stdlib.h&gt; #include&lt;inttypes.h&gt; int main(void){ FILE *fp; char *buffer,c; size_t filesize,buffer_size; int i; unsigned long long int expected_data=1976943448883713; fp=fopen("seqdata.c","r"); if(fp==NULL){ fputs("Error\n",stderr); exit(1); } fseek(fp,0L,SEEK_END); filesize=ftell(fp); printf("Size of seqdata file is:%u \n",filesize); fseek(fp,0L,SEEK_SET); buffer=(char*)malloc(sizeof(char)*filesize); if(buffer == NULL){ fputs("\nMemory error ",stderr); } buffer_size=fread(buffer,sizeof(char),filesize,fp); for(i=0;i&lt;buffer_size;i++){ printf("%c",*(buffer +i)); } printf("No of elements read from file are:%u \n",buffer_size); fseek(fp,0L,SEEK_SET); int current_pos = 0; while(current_pos &lt; buffer_size){ if(*(buffer +current_pos) != expected_data) { fputs("Error\n",stderr); exit(1); } else{ printf("data matching \n"); current_pos++; expected_data=next_exp_data(expected_data); } } fclose(fp); free(buffer); return 0; } int next_exp_data(unsigned long long int expected_data) { int i=0; unsigned long long int seq_gen_value=1976943448883713; unsigned long long int temp_data[10]; temp_data[0]=seq_gen_value; for(i=0;i&lt;10;i++) { printf("%llu",temp_data[i]); putchar('\n'); expected_data=temp_data[i]; temp_data[i+1]=temp_data[i] +2260630401189896; } return (expected_data); } </code></pre>
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    1. USUnicorn
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      1. POHow to extract a number/byte from an array in C?
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    1. COIf you formatted your code better I'd be inclined to help. Just indent all lines by 4 spaces or a tab.
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      1. POHow to extract a number/byte from an array in C?
      1. USClark Gaebel
    2. CO@Clark:I indented it.I want to take each number and compare character by character.
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      1. POHow to extract a number/byte from an array in C?
      1. USUnicorn
    3. CO@Thej: You've posted a lot of code, but only two lines to explain what you want to do. I don't understand what you want to do, and it looks like I'm not the only one. If you explain clearly what the program should do, you will get better answers.
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      1. POHow to extract a number/byte from an array in C?
      1. USGilles
 

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