HELP US PLEASE CAN'T FIGURE OUT ERRORS

Thank you so much we really need help! Here are the errors we got:

project3-1.ino:50:10: error: expected constructor, destructor, or type conversion before '(' token
project3-1.ino:51:10: error: expected constructor, destructor, or type conversion before '(' token
project3-1.ino:52:10: error: expected constructor, destructor, or type conversion before '(' token
project3-1.ino:53:10: error: expected constructor, destructor, or type conversion before '(' token
project3-1.ino:54:10: error: expected constructor, destructor, or type conversion before '(' token
project3-1.ino:55:10: error: expected constructor, destructor, or type conversion before '(' token
project3-1.ino:56:10: error: expected constructor, destructor, or type conversion before '(' token
project3-1.ino:57:10: error: expected constructor, destructor, or type conversion before '(' token
project3-1.ino:58:10: error: expected constructor, destructor, or type conversion before '(' token
project3-1.ino:59:10: error: expected constructor, destructor, or type conversion before '(' token
project3-1.ino:60:10: error: expected constructor, destructor, or type conversion before '(' token
project3-1.ino:61:10: error: expected constructor, destructor, or type conversion before '(' token
project3-1.ino:77:24: error: storage size of 'inputed_array' isn't known
project3-1.ino:83:10: error: expected constructor, destructor, or type conversion before '(' token
project3-1.ino: In function 'double calculatePPM(int)':
project3-1.ino:135:2: error: expected ';' before '}' token
project3-1.ino:140:5: error: expected ';' before 'Rs'
project3-1.ino:150:5: error: expected ';' before 'Rs'
project3-1.ino:160:5: error: expected ';' before 'Rs'
project3-1.ino: In function 'void float2Bytes(float, byte*)':
project3-1.ino:178:10: error: 'flt_array' was not declared in this scope
project3-1.ino: In function 'void LCD_INITIALIZE()':
project3-1.ino:195:65: error: assigning to an array from an initializer list
project3-1.ino:197:65: error: assigning to an array from an initializer list
project3-1.ino:199:65: error: assigning to an array from an initializer list
project3-1.ino:202:66: error: assigning to an array from an initializer list
project3-1.ino:203:64: error: assigning to an array from an initializer list
project3-1.ino:204:64: error: assigning to an array from an initializer list
project3-1.ino:205:67: error: assigning to an array from an initializer list
project3-1.ino:206:65: error: assigning to an array from an initializer list
project3-1.ino: In function 'int array_to_lcd_converter(double*, int)':
project3-1.ino:230:3: error: 'm' was not declared in this scope
project3-1.ino:231:3: error: 'num' was not declared in this scope
project3-1.ino:236:68: error: assigning to an array from an initializer list
project3-1.ino:237:70: error: assigning to an array from an initializer list
project3-1.ino:241:67: error: assigning to an array from an initializer list
project3-1.ino:245:69: error: assigning to an array from an initializer list
project3-1.ino:249:69: error: assigning to an array from an initializer list
project3-1.ino:252:10: error: 'pos' was not declared in this scope
project3-1.ino:254:8: error: expected '(' before 'inputed_array'
project3-1.ino:381:1: error: expected '}' at end of input
project3-1.ino:381:1: error: expected '}' at end of input